diff --git a/src/start-stop-daemon/start-stop-daemon.c b/src/start-stop-daemon/start-stop-daemon.c
index ef6f454eb..142326601 100644
--- a/src/start-stop-daemon/start-stop-daemon.c
+++ b/src/start-stop-daemon/start-stop-daemon.c
@@ -21,10 +21,8 @@
 
 #define ONE_MS           1000000
 
-#ifdef __linux__
-/* For extra SCHED_* defines. */
+/* For extra SCHED_* defines and pipe2. */
 # define _GNU_SOURCE
-#endif
 
 #include <errno.h>
 #include <fcntl.h>