diff --git a/test/functional/fixtures/shell-test.c b/test/functional/fixtures/shell-test.c
index cc447d903f..a744d5df46 100644
--- a/test/functional/fixtures/shell-test.c
+++ b/test/functional/fixtures/shell-test.c
@@ -4,7 +4,7 @@
 #include <stdio.h>
 #include <string.h>
 #include <stdint.h>
-#ifdef WIN32
+#ifdef _MSC_VER
 #include <Windows.h>
 #define usleep(usecs) Sleep(usecs/1000)
 #else