diff --git a/src/corelib/global/qendian_p.h b/src/corelib/global/qendian_p.h
index efa962937ff..1789e54ac84 100644
--- a/src/corelib/global/qendian_p.h
+++ b/src/corelib/global/qendian_p.h
@@ -21,7 +21,7 @@
 QT_BEGIN_NAMESPACE
 
 enum class QSpecialIntegerBitfieldInitializer {};
-constexpr QSpecialIntegerBitfieldInitializer QSpecialIntegerBitfieldZero{};
+constexpr inline QSpecialIntegerBitfieldInitializer QSpecialIntegerBitfieldZero{};
 
 template<class S>
 class QSpecialIntegerStorage