diff --git a/src/v4l.c b/src/v4l.c
index e0fdc45..81641fd 100644
--- a/src/v4l.c
+++ b/src/v4l.c
@@ -10,6 +10,10 @@
 #include "config.h"
 #endif
 
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE
+#endif
+
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <ctype.h>
@@ -911,7 +915,7 @@ AddV4LEnc(XF86VideoEncodingPtr enc, int entry,
     char *name;
 
 #if ABI_VIDEODRV_VERSION >= SET_ABI_VERSION(10, 0)
-    if (Xasprintf(&name, "%s-%s", norm, fixname(input)) < 0)
+    if (asprintf(&name, "%s-%s", norm, fixname(input)) < 0)
         name = NULL;
 #else
     name = Xprintf("%s-%s", norm, fixname(input));