diff --git a/src/corelib/global/qcomparehelpers.h b/src/corelib/global/qcomparehelpers.h
index 1c727a8f37f..8bf78d766bc 100644
--- a/src/corelib/global/qcomparehelpers.h
+++ b/src/corelib/global/qcomparehelpers.h
@@ -565,7 +565,7 @@ constexpr bool IsFloatType_v = std::is_floating_point_v<T>;
 
 #if QFLOAT16_IS_NATIVE
 template <>
-constexpr bool IsFloatType_v<QtPrivate::NativeFloat16Type> = true;
+inline constexpr bool IsFloatType_v<QtPrivate::NativeFloat16Type> = true;
 #endif
 
 } // namespace QtPrivate