diff --git a/loop.c b/loop.c
index c8bc2e7..f23f0f3 100644
--- a/loop.c
+++ b/loop.c
@@ -22,7 +22,6 @@
 #endif
 
 #define READLINE_CALLBACKS
-#define _GNU_SOURCE
 
 #include <assert.h>
 #include <stdio.h>
diff --git a/main.c b/main.c
index 88410be..de39372 100644
--- a/main.c
+++ b/main.c
@@ -21,8 +21,6 @@
 #include "config.h"
 #endif
 
-#define _GNU_SOURCE
-
 #include <stdio.h>
 #include <unistd.h>
 #include <stdlib.h>