diff --git a/plat/cpm/emu/fileio.c b/plat/cpm/emu/fileio.c
index a193805eb..d3df45785 100644
--- a/plat/cpm/emu/fileio.c
+++ b/plat/cpm/emu/fileio.c
@@ -1,5 +1,4 @@
-#define _XOPEN_SOURCE 500
-#define _POSIX_C_SOURCE 200809
+#define _XOPEN_SOURCE 700
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -440,4 +439,4 @@ int file_rename(cpm_filename_t* src, cpm_filename_t* dest)
 
 	int drivefd = get_drive_fd(src);
 	return renameat(drivefd, srcunixfilename, drivefd, destunixfilename);
-}
\ No newline at end of file
+}