diff --git a/FFmpegSource2/stdiostream.c b/FFmpegSource2/stdiostream.c
index 68c2f2f73..0fc809393 100644
--- a/FFmpegSource2/stdiostream.c
+++ b/FFmpegSource2/stdiostream.c
@@ -19,6 +19,7 @@
 //  THE SOFTWARE.
 
 #include "stdiostream.h"
+#include <errno.h>
 
 /* StdIoStream methods */