diff --git a/core/document_p.h b/core/document_p.h
index 2a977f6b6..770a71f01 100644
--- a/core/document_p.h
+++ b/core/document_p.h
@@ -194,7 +194,7 @@ class DocumentPrivate
         /**
          * Executes a JavaScript script from the setInterval function.
          *
-         * @since 1.7
+         * @since 1.9
         */
         void executeScript( const QString &function );
 
diff --git a/core/form.h b/core/form.h
index cd395dd4f..65f946869 100644
--- a/core/form.h
+++ b/core/form.h
@@ -57,17 +57,6 @@ class OKULARCORE_EXPORT FormField
             FormSignature    ///< A signature.
         };
 
-        /**
-         * The display types of the field.
-         */
-        enum FieldDisplay
-        {
-            FormVisible,
-            FormHidden,
-            FormNoPrint,
-            FormNoView
-        };
-
         virtual ~FormField();
 
         /**
@@ -124,14 +113,14 @@ class OKULARCORE_EXPORT FormField
         /**
           Whether this field is printable.
           
-          @since 1.7
+          @since 1.9
         */
         virtual bool isPrintable() const;
 
         /**
           Set this field printable
           
-          @since 1.7
+          @since 1.9
         */
         virtual void setPrintable( bool value );
 
@@ -235,7 +224,7 @@ class OKULARCORE_EXPORT FormFieldButton : public FormField
         /**
          * Sets the icon of the Button to the Icon of the field parameter.
          *
-         * @since 1.7
+         * @since 1.9
         */
         virtual void setIcon( Okular::FormField *field );
 
diff --git a/core/script/kjs_app.cpp b/core/script/kjs_app.cpp
index 3534906ec..c17acd13f 100644
--- a/core/script/kjs_app.cpp
+++ b/core/script/kjs_app.cpp
@@ -17,6 +17,7 @@
 #include <qapplication.h>
 
 #include <QLocale>
+#include <QTimer>
 
 #include <KLocalizedString>
 
@@ -26,6 +27,8 @@
 
 using namespace Okular;
 
+#define OKULAR_TIMERID QStringLiteral( "okular_timerID" )
+
 static KJSPrototype *g_appProto;
 typedef QHash< int, QTimer * > TimerCache;
 Q_GLOBAL_STATIC( TimerCache, g_timerCache )
@@ -212,7 +215,7 @@ static KJSObject appSetInterval( KJSContext *ctx, void *object,
 
     QTimer *timer = new QTimer();
 
-    QObject::connect( timer, &QTimer::timeout, [=](){ doc->executeScript( function ); } );
+    QObject::connect( timer, &QTimer::timeout, doc->m_parent, [=](){ doc->executeScript( function ); } );
 
     timer->start( interval );
 
@@ -224,7 +227,7 @@ static KJSObject appClearInterval( KJSContext *ctx, void *,
                                       const KJSArguments &arguments )
 {
     KJSObject timerObject = arguments.at( 0 );
-    const int timerId = timerObject.property( ctx, QStringLiteral("okular_timerID") ).toInt32( ctx );
+    const int timerId = timerObject.property( ctx, OKULAR_TIMERID ).toInt32( ctx );
     QTimer *timer = g_timerCache->value( timerId );
     if( timer != nullptr )
     {
@@ -247,7 +250,7 @@ static KJSObject appSetTimeOut( KJSContext *ctx, void *object,
     QTimer *timer = new QTimer();
     timer->setSingleShot( true );
 
-    QObject::connect( timer, &QTimer::timeout, [=](){ doc->executeScript( function ); } );
+    QObject::connect( timer, &QTimer::timeout, doc->m_parent, [=](){ doc->executeScript( function ); } );
 
     timer->start( interval );
 
@@ -259,7 +262,7 @@ static KJSObject appClearTimeOut( KJSContext *ctx, void *,
                                       const KJSArguments &arguments )
 {
     KJSObject timerObject = arguments.at( 0 );
-    const int timerId = timerObject.property( ctx, QStringLiteral("okular_timerID") ).toInt32( ctx );
+    const int timerId = timerObject.property( ctx, OKULAR_TIMERID ).toInt32( ctx );
     QTimer *timer = g_timerCache->value( timerId );
 
     if( timer != nullptr )
@@ -311,7 +314,7 @@ KJSObject JSApp::object( KJSContext *ctx, DocumentPrivate *doc )
 KJSObject JSApp::wrapTimer( KJSContext *ctx, QTimer *timer)
 {
     KJSObject timerObject = g_appProto->constructObject( ctx, timer );
-    timerObject.setProperty( ctx, QStringLiteral("okular_timerID"), timer->timerId() );
+    timerObject.setProperty( ctx, OKULAR_TIMERID, timer->timerId() );
 
     g_timerCache->insert( timer->timerId(), timer );
 
diff --git a/core/script/kjs_app_p.h b/core/script/kjs_app_p.h
index 64d996bca..06a79276c 100644
--- a/core/script/kjs_app_p.h
+++ b/core/script/kjs_app_p.h
@@ -13,8 +13,7 @@
 
 class KJSContext;
 class KJSObject;
-
-#include <QTimer>
+class QTimer;
 
 namespace Okular {
 
diff --git a/core/script/kjs_display.cpp b/core/script/kjs_display.cpp
index d7ed212b6..5fd758e81 100644
--- a/core/script/kjs_display.cpp
+++ b/core/script/kjs_display.cpp
@@ -15,8 +15,6 @@
 
 #include <QString>
 
-#include <memory>
-
 using namespace Okular;
 
 static KJSPrototype *g_displayProto;
@@ -24,25 +22,25 @@ static KJSPrototype *g_displayProto;
 // display.hidden
 static KJSObject displayGetHidden( KJSContext *, void *  )
 {
-    return KJSNumber( FormField::FormHidden );
+    return KJSNumber( FormDisplay::FormHidden );
 }
 
 // display.visible
 static KJSObject displayGetVisible( KJSContext *, void *  )
 {
-    return KJSNumber( FormField::FormVisible );
+    return KJSNumber( FormDisplay::FormVisible );
 }
 
 // display.noView
 static KJSObject displayGetNoView( KJSContext *, void *  )
 {
-    return KJSNumber( FormField::FormNoView );
+    return KJSNumber( FormDisplay::FormNoView );
 }
 
 // display.noPrint
 static KJSObject displayGetNoPrint( KJSContext *, void *  )
 {
-    return KJSNumber( FormField::FormNoPrint );
+    return KJSNumber( FormDisplay::FormNoPrint );
 }
 
 void JSDisplay::initType( KJSContext *ctx )
diff --git a/core/script/kjs_display_p.h b/core/script/kjs_display_p.h
index bc28faf29..20a85bab9 100644
--- a/core/script/kjs_display_p.h
+++ b/core/script/kjs_display_p.h
@@ -15,6 +15,17 @@ class KJSObject;
 
 namespace Okular {
 
+/**
+ * The display types of the field.
+*/
+enum FormDisplay
+{
+    FormVisible,
+    FormHidden,
+    FormNoPrint,
+    FormNoView
+};
+
 class JSDisplay
 {
     public:
diff --git a/core/script/kjs_field.cpp b/core/script/kjs_field.cpp
index 8a5e5eef6..bb7b6b5d9 100644
--- a/core/script/kjs_field.cpp
+++ b/core/script/kjs_field.cpp
@@ -17,16 +17,18 @@
 #include <qhash.h>
 
 #include <QDebug>
-#include <memory>
 
 #include "../debug_p.h"
 #include "../document_p.h"
 #include "../form.h"
 #include "../page.h"
 #include "../page_p.h"
+#include "kjs_display_p.h"
 
 using namespace Okular;
 
+#define OKULAR_NAME QStringLiteral("okular_name")
+
 static KJSPrototype *g_fieldProto;
 
 typedef QHash< FormField *, Page * > FormCache;
@@ -234,9 +236,9 @@ static KJSObject fieldGetDisplay( KJSContext *, void *object )
     bool visible = field->isVisible();
     if( visible )
     {
-        return KJSNumber( field->isPrintable() ? FormField::FormVisible : FormField::FormNoPrint );
+        return KJSNumber( field->isPrintable() ? FormDisplay::FormVisible : FormDisplay::FormNoPrint );
     }
-    return KJSNumber( field->isPrintable() ? FormField::FormNoView : FormField::FormHidden );
+    return KJSNumber( field->isPrintable() ? FormDisplay::FormNoView : FormDisplay::FormHidden );
 }
 
 // Field.display (setter)
@@ -246,19 +248,19 @@ static void fieldSetDisplay( KJSContext *context, void *object, KJSObject value
     const unsigned int b = value.toInt32( context );
     switch( b )
     {
-        case FormField::FormVisible:
+        case FormDisplay::FormVisible:
             field->setVisible( true );
             field->setPrintable( true );
             break;
-        case FormField::FormHidden:
+        case FormDisplay::FormHidden:
             field->setVisible( false );
             field->setPrintable( false );
             break;
-        case FormField::FormNoPrint:
+        case FormDisplay::FormNoPrint:
             field->setVisible( true );
             field->setPrintable( false );
             break;
-        case FormField::FormNoView:
+        case FormDisplay::FormNoView:
             field->setVisible( false );
             field->setPrintable( true );
             break;
@@ -273,7 +275,7 @@ static KJSObject fieldButtonGetIcon( KJSContext *ctx, void *object,
     FormField *field = reinterpret_cast< FormField * >( object );
     
     KJSObject fieldObject;
-    fieldObject.setProperty( ctx, QStringLiteral("okular_name"), field->name() );
+    fieldObject.setProperty( ctx, OKULAR_NAME, field->name() );
     g_buttonCache->insert( field->name(), field );
 
     return fieldObject;
@@ -287,7 +289,7 @@ static KJSObject fieldButtonSetIcon( KJSContext *ctx, void *object,
 {
     FormField *field = reinterpret_cast< FormField * >( object );
 
-    const QString fieldName = arguments.at( 0 ).property( ctx, QStringLiteral("okular_name") ).toString( ctx );
+    const QString fieldName = arguments.at( 0 ).property( ctx, OKULAR_NAME ).toString( ctx );
 
     if( field->type() == Okular::FormField::FormButton )
     {
diff --git a/core/script/kjs_ocg.cpp b/core/script/kjs_ocg.cpp
index d7061f066..9c1c1fee6 100644
--- a/core/script/kjs_ocg.cpp
+++ b/core/script/kjs_ocg.cpp
@@ -18,8 +18,6 @@
 #include <QDebug>
 #include <QPair>
 
-#include <memory>
-
 using namespace Okular;
 
 static KJSPrototype *g_OCGProto;
@@ -42,7 +40,7 @@ static KJSObject OCGGetState( KJSContext *, void *object )
 
 // OCG.state (setter)
 static void OCGSetState( KJSContext* ctx, void* object,
-                           KJSObject value )
+                         KJSObject value )
 {
    	QPair< int, int > *pair = reinterpret_cast< QPair< int, int >* > ( object );
    	QAbstractItemModel *model = g_OCGCache->value( pair );
@@ -85,4 +83,4 @@ void JSOCG::clearCachedFields()
     {
         g_OCGCache->clear();
     }
-}
\ No newline at end of file
+}
diff --git a/core/script/kjs_ocg_p.h b/core/script/kjs_ocg_p.h
index dcfcebdca..894757df7 100644
--- a/core/script/kjs_ocg_p.h
+++ b/core/script/kjs_ocg_p.h
@@ -27,4 +27,4 @@ class JSOCG
 
 }
 
-#endif
\ No newline at end of file
+#endif
diff --git a/generators/poppler/formfields.cpp b/generators/poppler/formfields.cpp
index 869d2cc3a..2092c5220 100644
--- a/generators/poppler/formfields.cpp
+++ b/generators/poppler/formfields.cpp
@@ -110,7 +110,7 @@ bool PopplerFormFieldButton::isPrintable() const
 #ifdef HAVE_POPPLER_0_79
     return m_field->isPrintable();
 #else
-    return m_field->isVisible() ? true : false;
+    return true;
 #endif
 }
 
@@ -244,7 +244,7 @@ bool PopplerFormFieldText::isPrintable() const
 #ifdef HAVE_POPPLER_0_79
     return m_field->isPrintable();
 #else
-    return m_field->isVisible() ? true : false;
+    return true;
 #endif
 }
 
@@ -374,7 +374,7 @@ bool PopplerFormFieldChoice::isPrintable() const
 #ifdef HAVE_POPPLER_0_79
     return m_field->isPrintable();
 #else
-    return m_field->isVisible() ? true : false;
+    return true;
 #endif
 }
 
diff --git a/generators/poppler/formfields.h b/generators/poppler/formfields.h
index 56d23580e..fab0e1393 100644
--- a/generators/poppler/formfields.h
+++ b/generators/poppler/formfields.h
@@ -43,7 +43,7 @@ class PopplerFormFieldButton : public Okular::FormFieldButton
         /*
          * Supported only in newer versions of Poppler library.
          *
-         * @since 1.7
+         * @since 1.9
         */
         Poppler::FormFieldIcon icon() const;
 #endif