diff --git a/Include/objimpl.h b/Include/objimpl.h
index 63465009e3a..b577be2df3b 100644
--- a/Include/objimpl.h
+++ b/Include/objimpl.h
@@ -251,7 +251,7 @@ typedef union _gc_head {
         union _gc_head *gc_prev;
         Py_ssize_t gc_refs;
     } gc;
-    long double dummy;  /* force worst-case alignment */
+    double dummy;  /* force worst-case alignment */
 } PyGC_Head;
 
 extern PyGC_Head *_PyGC_generation0;