diff --git a/src/tools/vmap4_extractor/vmapexport.cpp b/src/tools/vmap4_extractor/vmapexport.cpp
index c17230f2a44..7626886660b 100644
--- a/src/tools/vmap4_extractor/vmapexport.cpp
+++ b/src/tools/vmap4_extractor/vmapexport.cpp
@@ -23,7 +23,7 @@
 #include <list>
 #include <errno.h>
 
-#ifdef WIN32
+#ifdef _WIN32
     #include <Windows.h>
     #include <sys/stat.h>
     #include <direct.h>