diff --git a/vcg/space/index/spatial_hashing.h b/vcg/space/index/spatial_hashing.h
index 0f01b135..5aab1eda 100644
--- a/vcg/space/index/spatial_hashing.h
+++ b/vcg/space/index/spatial_hashing.h
@@ -29,7 +29,7 @@
 //#include <map>
 #include <vector>
 #include <algorithm>
-#ifdef WIN32
+#ifdef _WIN32
  #ifndef __MINGW32__
   #include <hash_map>
   #define STDEXT stdext