diff --git a/src/libs/clangbackendipc/dynamicastmatcherdiagnosticmessagecontainer.h b/src/libs/clangbackendipc/dynamicastmatcherdiagnosticmessagecontainer.h
index 50935185627..bd7d2d3ee4f 100644
--- a/src/libs/clangbackendipc/dynamicastmatcherdiagnosticmessagecontainer.h
+++ b/src/libs/clangbackendipc/dynamicastmatcherdiagnosticmessagecontainer.h
@@ -101,7 +101,7 @@ public:
 
 private:
     V2::SourceRangeContainer sourceRange_;
-    ClangQueryDiagnosticErrorType errorType_;
+    ClangQueryDiagnosticErrorType errorType_ = ClangQueryDiagnosticErrorType::None;
     Utils::SmallStringVector arguments_;
 };