diff --git a/src/kernel/db/berkeley.c b/src/kernel/db/berkeley.c
index 6ccc23b93..5a65ee3b0 100644
--- a/src/kernel/db/berkeley.c
+++ b/src/kernel/db/berkeley.c
@@ -1,6 +1,3 @@
-#ifdef __APPLE__
-#define _DARWIN_C_SOURCE
-#endif
 #include <sys/types.h>
 #include <db.h>