diff --git a/sys/dev/isp/isp_freebsd.h b/sys/dev/isp/isp_freebsd.h
index b2da1382944..24c6695d16e 100644
--- a/sys/dev/isp/isp_freebsd.h
+++ b/sys/dev/isp/isp_freebsd.h
@@ -76,7 +76,7 @@
 #endif
 
 #define	HANDLE_LOOPSTATE_IN_OUTER_LAYERS	1
-#define	ISP_SMPLOCK			1
+/* #define	ISP_SMPLOCK			1 */
 
 #ifdef	ISP_SMPLOCK
 #define	ISP_IFLAGS	INTR_TYPE_CAM | INTR_ENTROPY | INTR_MPSAFE