diff --git a/src/libs/clangsupport/clangsupport_global.h b/src/libs/clangsupport/clangsupport_global.h
index b2fc639291a..f69b11b7d2e 100644
--- a/src/libs/clangsupport/clangsupport_global.h
+++ b/src/libs/clangsupport/clangsupport_global.h
@@ -154,7 +154,7 @@ struct MessageTrait<Message> \
 using MixinHighlightingTypes = Utils::SizedArray<HighlightingType, 6>;
 
 struct HighlightingTypes {
-    HighlightingType mainHighlightingType;
+    HighlightingType mainHighlightingType = HighlightingType::Invalid;
     MixinHighlightingTypes mixinHighlightingTypes;
 };