diff --git a/test/src/mtx.c b/test/src/mtx.c
index 41b95d59..73bd02f6 100644
--- a/test/src/mtx.c
+++ b/test/src/mtx.c
@@ -1,5 +1,9 @@
 #include "test/jemalloc_test.h"
 
+#ifndef _CRT_SPINCOUNT
+#define	_CRT_SPINCOUNT 4000
+#endif
+
 bool
 mtx_init(mtx_t *mtx)
 {