diff --git a/Include/pythread.h b/Include/pythread.h
index eb61033b2d9089..d4d0e4ea172ce2 100644
--- a/Include/pythread.h
+++ b/Include/pythread.h
@@ -134,7 +134,7 @@ struct _Py_tss_t {
 #undef NATIVE_TSS_KEY_T
 
 /* When static allocation, you must initialize with Py_tss_NEEDS_INIT. */
-#define Py_tss_NEEDS_INIT   {0}
+#define Py_tss_NEEDS_INIT   ((Py_tss_t) {0})
 #endif  /* !Py_LIMITED_API */
 
 PyAPI_FUNC(Py_tss_t *) PyThread_tss_alloc(void);