diff --git a/src/plugins/logger/logger.c b/src/plugins/logger/logger.c
index 9ced402db..0f2850038 100644
--- a/src/plugins/logger/logger.c
+++ b/src/plugins/logger/logger.c
@@ -21,9 +21,7 @@
  * logger.c: logger plugin for WeeChat: save buffer lines to disk files
  */
 
-#ifndef _GNU_SOURCE
-#define _GNU_SOURCE 1
-#endif
+#define _XOPEN_SOURCE 700
 
 #include <stdlib.h>
 #include <unistd.h>