diff --git a/cmake_templates/Doxyfile.in b/cmake_templates/Doxyfile.in
index 1951c58504a..d84f214b9cc 100644
--- a/cmake_templates/Doxyfile.in
+++ b/cmake_templates/Doxyfile.in
@@ -2384,7 +2384,7 @@ INCLUDE_FILE_PATTERNS  =
 # recursively expanded use the := operator instead of the = operator.
 # This tag requires that the tag ENABLE_PREPROCESSING is set to YES.
 
-PREDEFINED             =
+PREDEFINED             = "Q_DECLARE_FLAGS(Flags, Enum)=typedef QFlags<Enum> Flags;"
 
 # If the MACRO_EXPANSION and EXPAND_ONLY_PREDEF tags are set to YES then this
 # tag can be used to specify a list of macro names that should be expanded. The