diff --git a/zsnes/src/zloader.c b/zsnes/src/zloader.c
index f16de600..1ec8f7cf 100644
--- a/zsnes/src/zloader.c
+++ b/zsnes/src/zloader.c
@@ -24,6 +24,7 @@ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 #include "gblhdr.h"
 #define DIR_SLASH '/'
 #else
+#define _POSIX_
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
diff --git a/zsnes/src/zmovie.c b/zsnes/src/zmovie.c
index 22426e56..99964f16 100644
--- a/zsnes/src/zmovie.c
+++ b/zsnes/src/zmovie.c
@@ -25,6 +25,7 @@ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 #define DIR_SLASH "/"
 #define WRITE_BINARY "w"
 #else
+#define _POSIX_
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>