diff --git a/src/collectionpage/collectionexpirywidget.cpp b/src/collectionpage/collectionexpirywidget.cpp
index 4815d44..7b1e6d6 100644
--- a/src/collectionpage/collectionexpirywidget.cpp
+++ b/src/collectionpage/collectionexpirywidget.cpp
@@ -37,7 +37,7 @@ public:
         setSpecialValueText(i18n("Never"));
     }
 
-    QString textFromValue(int value) const override
+    Q_REQUIRED_RESULT QString textFromValue(int value) const override
     {
         if (value == 0) {
             return i18n("Never");
@@ -45,7 +45,7 @@ public:
         return KPluralHandlingSpinBox::textFromValue(value);
     }
 
-    int valueFromText(const QString &text) const override
+    Q_REQUIRED_RESULT int valueFromText(const QString &text) const override
     {
         return KPluralHandlingSpinBox::valueFromText(text);
     }
diff --git a/src/filter/autotests/filteractionwithaddresstest.cpp b/src/filter/autotests/filteractionwithaddresstest.cpp
index adb6449..79ea060 100644
--- a/src/filter/autotests/filteractionwithaddresstest.cpp
+++ b/src/filter/autotests/filteractionwithaddresstest.cpp
@@ -23,7 +23,7 @@ public:
         return GoOn;
     }
 
-    MailCommon::SearchRule::RequiredPart requiredPart() const override
+    Q_REQUIRED_RESULT MailCommon::SearchRule::RequiredPart requiredPart() const override
     {
         return MailCommon::SearchRule::CompleteMessage;
     }
diff --git a/src/search/autotests/searchruletest.cpp b/src/search/autotests/searchruletest.cpp
index 6b78570..ddbdf6e 100644
--- a/src/search/autotests/searchruletest.cpp
+++ b/src/search/autotests/searchruletest.cpp
@@ -17,18 +17,18 @@ public:
     {
     }
 
-    bool matches(const Akonadi::Item &item) const override
+    Q_REQUIRED_RESULT bool matches(const Akonadi::Item &item) const override
     {
         Q_UNUSED(item)
         return false;
     }
 
-    bool isEmpty() const override
+    Q_REQUIRED_RESULT bool isEmpty() const override
     {
         return false;
     }
 
-    MailCommon::SearchRule::RequiredPart requiredPart() const override
+    Q_REQUIRED_RESULT MailCommon::SearchRule::RequiredPart requiredPart() const override
     {
         return MailCommon::SearchRule::CompleteMessage;
     }
diff --git a/src/search/searchpatternedit.cpp b/src/search/searchpatternedit.cpp
index ef88f7d..2c0a31a 100644
--- a/src/search/searchpatternedit.cpp
+++ b/src/search/searchpatternedit.cpp
@@ -44,7 +44,7 @@ static const struct {
     const KLazyLocalizedString displayName;
 #endif
 
-    QString getLocalizedDisplayName() const
+    Q_REQUIRED_RESULT QString getLocalizedDisplayName() const
     {
 #if KI18N_VERSION < QT_VERSION_CHECK(5, 89, 0)
         return i18n(displayName);
diff --git a/src/snippets/snippetsmanager.cpp b/src/snippets/snippetsmanager.cpp
index 8deda41..eedcda1 100644
--- a/src/snippets/snippetsmanager.cpp
+++ b/src/snippets/snippetsmanager.cpp
@@ -35,7 +35,7 @@ public:
     {
     }
 
-    QModelIndex currentGroupIndex() const;
+    Q_REQUIRED_RESULT QModelIndex currentGroupIndex() const;
 
     void selectionChanged();
     void dndDone();
diff --git a/src/snippets/snippetsmodel.cpp b/src/snippets/snippetsmodel.cpp
index f0d693d..2605010 100644
--- a/src/snippets/snippetsmodel.cpp
+++ b/src/snippets/snippetsmodel.cpp
@@ -41,10 +41,10 @@ public:
 
     void appendChild(SnippetItem *child);
     void removeChild(SnippetItem *child);
-    SnippetItem *child(int row) const;
+    Q_REQUIRED_RESULT SnippetItem *child(int row) const;
     Q_REQUIRED_RESULT int childCount() const;
     Q_REQUIRED_RESULT int row() const;
-    SnippetItem *parent() const;
+    Q_REQUIRED_RESULT SnippetItem *parent() const;
 
     Q_REQUIRED_RESULT QString subject() const;
     void setSubject(const QString &subject);
diff --git a/src/widgets/redirectdialog.cpp b/src/widgets/redirectdialog.cpp
index d7b4f71..cce1936 100644
--- a/src/widgets/redirectdialog.cpp
+++ b/src/widgets/redirectdialog.cpp
@@ -43,7 +43,7 @@ public:
     void slotUser1();
     void slotUser2();
     void slotAddressChanged(const QString &);
-    QString redirectLabelType(TypeAddress type) const;
+    Q_REQUIRED_RESULT QString redirectLabelType(TypeAddress type) const;
     RedirectDialog *const q = nullptr;
     RedirectWidget *mEditTo = nullptr;
     RedirectWidget *mEditCc = nullptr;