diff --git a/Contrib/VPatch/Source/GenPat/adler32.cpp b/Contrib/VPatch/Source/GenPat/adler32.cpp
index 74747334..3f023cb3 100644
--- a/Contrib/VPatch/Source/GenPat/adler32.cpp
+++ b/Contrib/VPatch/Source/GenPat/adler32.cpp
@@ -26,6 +26,7 @@
  */
 
 #include "adler32.h"
+#include <limits.h>
 namespace zlib {
 #include <zlib.h>
 }