diff --git a/src/corelib/global/qflags.h b/src/corelib/global/qflags.h
index 82fcbdd54dc..c6ecb1ea47f 100644
--- a/src/corelib/global/qflags.h
+++ b/src/corelib/global/qflags.h
@@ -145,7 +145,7 @@ class QFlags
 
     constexpr inline bool operator!() const noexcept { return !i; }
 
-    constexpr inline bool testFlag(Enum flag) const noexcept { return (i & Int(flag)) == Int(flag) && (Int(flag) != 0 || i == Int(flag) ); }
+    constexpr inline bool testFlag(Enum flag) const noexcept { return (i & Int(flag)) == Int(flag) && (Int(flag) != 0 || i == Int(0) ); }
     constexpr inline QFlags &setFlag(Enum flag, bool on = true) noexcept
     {
         return on ? (*this |= flag) : (*this &= ~QFlags(flag));