diff --git a/src/corelib/thread/qwaitcondition_p.h b/src/corelib/thread/qwaitcondition_p.h
index 14833d56eff..c99fa8d6923 100644
--- a/src/corelib/thread/qwaitcondition_p.h
+++ b/src/corelib/thread/qwaitcondition_p.h
@@ -28,7 +28,7 @@ namespace QtPrivate {
 // Ideal alignment for mutex and condition_variable: it's the hardware
 // interference size (size of a cache line) if the types are likely to contain
 // the actual data structures, otherwise just that of a pointer.
-static constexpr quintptr IdealMutexAlignment =
+inline constexpr quintptr IdealMutexAlignment =
         sizeof(std::mutex) > sizeof(void *) &&
         sizeof(std::condition_variable) > sizeof(void *) ?
             64 : alignof(void*);