diff --git a/include/poll.h b/include/poll.h
index 472e4b84..bf9cb99a 100644
--- a/include/poll.h
+++ b/include/poll.h
@@ -36,7 +36,7 @@ struct pollfd {
 
 int poll (struct pollfd *, nfds_t, int);
 
-#ifdef _GNU_SOURCE
+#ifdef _BSD_SOURCE
 #define __NEED_time_t
 #define __NEED_struct_timespec
 #define __NEED_sigset_t
@@ -45,7 +45,7 @@ int ppoll(struct pollfd *, nfds_t, const struct timespec *, const sigset_t *);
 #endif
 
 #if _REDIR_TIME64
-#ifdef _GNU_SOURCE
+#ifdef _BSD_SOURCE
 __REDIR(ppoll, __ppoll_time64);
 #endif
 #endif
diff --git a/src/select/ppoll.c b/src/select/ppoll.c
index e614600a..9a0bf929 100644
--- a/src/select/ppoll.c
+++ b/src/select/ppoll.c
@@ -1,4 +1,4 @@
-#define _GNU_SOURCE
+#define _BSD_SOURCE
 #include <poll.h>
 #include <signal.h>
 #include <errno.h>