diff --git a/test/egl_epoxy_api.c b/test/egl_epoxy_api.c
index 2c1b257..a840525 100644
--- a/test/egl_epoxy_api.c
+++ b/test/egl_epoxy_api.c
@@ -27,6 +27,7 @@
  * Tests the Epoxy API using EGL.
  */
 
+#define _GNU_SOURCE
 #include <stdio.h>
 #include <string.h>
 #include <stdlib.h>
diff --git a/test/egl_has_extension_nocontext.c b/test/egl_has_extension_nocontext.c
index 94a7faa..a95860a 100644
--- a/test/egl_has_extension_nocontext.c
+++ b/test/egl_has_extension_nocontext.c
@@ -28,6 +28,7 @@
  * no context bound would fail out in dispatch.
  */
 
+#define _GNU_SOURCE
 #include <stdio.h>
 #include <string.h>
 #include <stdlib.h>