diff --git a/common/crash.cpp b/common/crash.cpp
index 6c7329b46..cb02a0bb4 100644
--- a/common/crash.cpp
+++ b/common/crash.cpp
@@ -15,7 +15,7 @@
 #include <cstdio>
 #include <vector>
 
-#if WINDOWS
+#ifdef _WINDOWS
 #define popen _popen
 #endif