diff --git a/src/editor/kmcomposerwin.cpp b/src/editor/kmcomposerwin.cpp
index 3597960a2..cce8fa863 100644
--- a/src/editor/kmcomposerwin.cpp
+++ b/src/editor/kmcomposerwin.cpp
@@ -188,11 +188,6 @@
 #include <gpgme++/keylistresult.h>
 #include <gpgme++/key.h>
 
-// System includes
-#include <stdlib.h>
-#include <unistd.h>
-#include <fcntl.h>
-#include <memory>
 #include <KSplitterCollapserButton>
 #include <Akonadi/Contact/ContactGroupExpandJob>
 #include <editor/potentialphishingemail/potentialphishingemailjob.h>
diff --git a/src/kmcommands.cpp b/src/kmcommands.cpp
index 44830160b..629eb267f 100644
--- a/src/kmcommands.cpp
+++ b/src/kmcommands.cpp
@@ -112,9 +112,6 @@
 
 #include <gpgme++/error.h>
 
-#include <algorithm>
-#include <memory>
-#include <unistd.h> // link()
 #include <KBookmarkManager>
 
 #include <KDBusServiceStarter>
diff --git a/src/kmkernel.cpp b/src/kmkernel.cpp
index 3e9648e88..2443fb7b5 100644
--- a/src/kmkernel.cpp
+++ b/src/kmkernel.cpp
@@ -102,13 +102,6 @@ using KMail::MailServiceImpl;
 #include <QtDBus/QtDBus>
 #include <QMimeDatabase>
 
-#include <sys/types.h>
-#include <dirent.h>
-#include <sys/stat.h>
-#include <unistd.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <assert.h>
 #include <MailCommon/ResourceReadConfigFile>
 
 #include <kstartupinfo.h>
diff --git a/src/kmreaderwin.cpp b/src/kmreaderwin.cpp
index ec39e4167..76209ec1e 100644
--- a/src/kmreaderwin.cpp
+++ b/src/kmreaderwin.cpp
@@ -80,12 +80,6 @@ using namespace MessageViewer;
 #undef Never
 #undef Always
 
-#include <unistd.h>
-#include <stdlib.h>
-#include <sys/stat.h>
-#include <stdio.h>
-#include <ctype.h>
-#include <string.h>
 #include <mailcommon/mailutil.h>
 
 using namespace KMail;