diff --git a/contrib/unzip/crypt.c b/contrib/unzip/crypt.c
index 299ce03d2..4cc731b3e 100644
--- a/contrib/unzip/crypt.c
+++ b/contrib/unzip/crypt.c
@@ -43,10 +43,10 @@
 
 #include "crypt.h"
 
-#ifdef _WIN32
+#ifdef _MSC_VER
 #   pragma warning(push)
 #   pragma warning(disable : 4244)
-#endif // _WIN32
+#endif // _MSC_VER
 
 /***************************************************************************/
 
@@ -164,8 +164,8 @@ int crypthead(const char *passwd, uint8_t *buf, int buf_size, uint32_t *pkeys,
     return n;
 }
 
-#ifdef _WIN32
+#ifdef _MSC_VER
 #   pragma warning(pop)
-#endif // _WIN32
+#endif // _MSC_VER
 
 /***************************************************************************/
diff --git a/contrib/unzip/ioapi.c b/contrib/unzip/ioapi.c
index 30a296d0f..d9ae01e7d 100644
--- a/contrib/unzip/ioapi.c
+++ b/contrib/unzip/ioapi.c
@@ -23,8 +23,10 @@
 
 #ifdef _WIN32
 #   define snprintf _snprintf
+#ifdef _MSC_VER
 #   pragma warning(push)
 #   pragma warning(disable : 4131 4100)
+#endif
 #   ifdef __clang__
 #       pragma clang diagnostic push
 #       pragma clang diagnostic ignored "-Wunused-parameter"
@@ -357,9 +359,9 @@ void fill_fopen64_filefunc(zlib_filefunc64_def *pzlib_filefunc_def)
     pzlib_filefunc_def->opaque = NULL;
 }
 
-#ifdef _WIN32
+#ifdef _MSC_VER
 #   pragma warning(pop)
 #   ifdef __clang__
 #       pragma clang diagnostic pop
 #   endif
-#endif // _WIN32
+#endif // _MSC_VER
diff --git a/contrib/unzip/unzip.c b/contrib/unzip/unzip.c
index f1eddeeda..b2f045b0a 100644
--- a/contrib/unzip/unzip.c
+++ b/contrib/unzip/unzip.c
@@ -73,10 +73,10 @@
 #  define TRYFREE(p) {if (p) free(p);}
 #endif
 
-#ifdef _WIN32
+#ifdef _MSC_VER
 #   pragma warning(push)
 #   pragma warning(disable : 4131 4244 4189 4245)
-#endif // _WIN32
+#endif // _MSC_VER
 
 const char unz_copyright[] =
    " unzip 1.01 Copyright 1998-2004 Gilles Vollant - http://www.winimage.com/zLibDll";
@@ -1995,6 +1995,6 @@ extern int ZEXPORT unzEndOfFile(unzFile file)
     return 0;
 }
 
-#ifdef _WIN32
+#ifdef _MSC_VER
 #   pragma warning(pop)
-#endif // _WIN32
\ No newline at end of file
+#endif // _MSC_VER
\ No newline at end of file