diff --git a/src/interp/iz3hash.h b/src/interp/iz3hash.h
index a12cfb990..cd94f0e04 100644
--- a/src/interp/iz3hash.h
+++ b/src/interp/iz3hash.h
@@ -29,6 +29,10 @@ Revision History:
 #ifndef IZ3_HASH_H
 #define IZ3_HASH_H
 
+#ifdef _WINDOWS
+#pragma warning(disable:4267)
+#endif
+
 #include <string>
 #include <vector>
 #include <iterator>