diff --git a/contrib/jemalloc/src/pages.c b/contrib/jemalloc/src/pages.c
index 6b00eb0cb919..6405bb528984 100644
--- a/contrib/jemalloc/src/pages.c
+++ b/contrib/jemalloc/src/pages.c
@@ -464,10 +464,12 @@ os_overcommits_sysctl(void) {
 	}
 #endif
 
-#ifdef SWAP_RESERVE_FORCE_ON
+#ifndef SWAP_RESERVE_FORCE_ON
+#define	SWAP_RESERVE_FORCE_ON		(1 << 0)
+#define	SWAP_RESERVE_RLIMIT_ON		(1 << 1)
+#endif
 	return ((vm_overcommit & (SWAP_RESERVE_FORCE_ON |
 	    SWAP_RESERVE_RLIMIT_ON)) == 0);
-#endif
 }
 #endif