diff --git a/include/stdio.h b/include/stdio.h
index 9175b159a88..840a6a5818d 100644
--- a/include/stdio.h
+++ b/include/stdio.h
@@ -41,6 +41,7 @@
 /* File System Definitions **************************************************/
 
 #define FILENAME_MAX _POSIX_NAME_MAX
+#define FOPEN_MAX    _POSIX_STREAM_MAX
 
 /* The (default) size of the I/O buffers */