diff --git a/ncdump/ncdump.c b/ncdump/ncdump.c
index 9fea6684b..7f22520f9 100644
--- a/ncdump/ncdump.c
+++ b/ncdump/ncdump.c
@@ -18,7 +18,7 @@ Research/Unidata. See \ref copyright file for more info.  */
 #include <fcntl.h>
 #endif
 
-#ifdef _WIN32
+#ifdef _MSC_VER
 #define snprintf _snprintf
 #include "XGetopt.h"
 int opterr;
diff --git a/ncdump/ocprint.c b/ncdump/ocprint.c
index 0c4e0da03..5c90887b3 100644
--- a/ncdump/ocprint.c
+++ b/ncdump/ocprint.c
@@ -30,7 +30,7 @@
 #include "oc.h"
 #include "ocx.h"
 
-#ifdef _WIN32
+#ifdef _MSC_VER
 #include "XGetopt.h"
 int opterr, optind;
 char* optarg;