diff --git a/src/libs/3rdparty/cplusplus/Symbols.h b/src/libs/3rdparty/cplusplus/Symbols.h
index 4cd8141beb1..e29f78bf017 100644
--- a/src/libs/3rdparty/cplusplus/Symbols.h
+++ b/src/libs/3rdparty/cplusplus/Symbols.h
@@ -503,7 +503,7 @@ protected:
     virtual void visitSymbol0(SymbolVisitor *visitor);
 
 private:
-    bool _isVariadic;
+    bool _isVariadic = false;
     bool _isVirtual;
     FullySpecifiedType _type;
 };