diff --git a/sys/kern/subr_prof.c b/sys/kern/subr_prof.c
index 1797f7a38142..d2cfe65660e3 100644
--- a/sys/kern/subr_prof.c
+++ b/sys/kern/subr_prof.c
@@ -534,7 +534,8 @@ out:
 	PROC_UNLOCK(p);
 }
 
-#if defined(__i386__) && __GNUC__ >= 2 && !defined(__INTEL_COMPILER)
+#if (defined(__amd64__) || defined(__i386__)) && __GNUC__ >= 2 && \
+	!defined(__INTEL_COMPILER)
 /*
  * Support for "--test-coverage --profile-arcs" in GCC.
  *