diff --git a/src/corelib/kernel/qmetatype.cpp b/src/corelib/kernel/qmetatype.cpp
index 9554a844f1..43e633faaf 100644
--- a/src/corelib/kernel/qmetatype.cpp
+++ b/src/corelib/kernel/qmetatype.cpp
@@ -518,7 +518,7 @@ int QMetaType::idHelper() const
 }
 
 /*!
-    \fn constexpr bool QMetaType::sizeOf() const
+    \fn constexpr qsizetype QMetaType::sizeOf() const
     \since 5.0
 
     Returns the size of the type in bytes (i.e. sizeof(T),