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-rw-r--r--backend/drm/drm.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/backend/drm/drm.c b/backend/drm/drm.c
index b4d8a069..fc514229 100644
--- a/backend/drm/drm.c
+++ b/backend/drm/drm.c
@@ -1,4 +1,4 @@
-#define _XOPEN_SOURCE 700
+#define _POSIX_C_SOURCE 200809L
#include <assert.h>
#include <drm_fourcc.h>
#include <drm_mode.h>