diff --git a/src/racket/gc2/sighand.c b/src/racket/gc2/sighand.c
index 5e79bbbba1..7b137fa5f4 100644
--- a/src/racket/gc2/sighand.c
+++ b/src/racket/gc2/sighand.c
@@ -125,7 +125,7 @@ void fault_handler(int sn, struct siginfo *si, void *ctx)
 
 /* ========== FreeBSD/NetBSD/OpenBSD signal handler ========== */
 /*  As of 2007/06/29, this is a guess for NetBSD!  */
-#if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__)
+#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__NetBSD__) || defined(__OpenBSD__)
 # include <signal.h>
 # include <sys/param.h>
 void fault_handler(int sn, siginfo_t *si, void *ctx)