diff --git a/sys/dev/tws/tws.c b/sys/dev/tws/tws.c
index 00446252b2af..de7d20bf900b 100644
--- a/sys/dev/tws/tws.c
+++ b/sys/dev/tws/tws.c
@@ -349,7 +349,7 @@ tws_detach(device_t dev)
 {
     struct tws_softc *sc = device_get_softc(dev);
     int i;
-    u_int32_t reg __diagused;
+    u_int32_t reg __tws_debug;
 
     TWS_TRACE_DEBUG(sc, "entry", 0, 0);
 
diff --git a/sys/dev/tws/tws_hdm.c b/sys/dev/tws/tws_hdm.c
index 11d9320948a0..bebece529c97 100644
--- a/sys/dev/tws/tws_hdm.c
+++ b/sys/dev/tws/tws_hdm.c
@@ -82,7 +82,7 @@ void tws_display_ctlr_info(struct tws_softc *sc);
 int 
 tws_init_ctlr(struct tws_softc *sc)
 {
-    u_int64_t reg __diagused;
+    u_int64_t reg __tws_debug;
     u_int32_t regh, regl;
 
     TWS_TRACE_DEBUG(sc, "entry", sc, sc->is64bit);
diff --git a/sys/dev/tws/tws_services.h b/sys/dev/tws/tws_services.h
index e0e5b756981a..079697e9b186 100644
--- a/sys/dev/tws/tws_services.h
+++ b/sys/dev/tws/tws_services.h
@@ -61,10 +61,12 @@ void tws_init_qs(struct tws_softc *sc);
 #endif
 
 #ifdef TWS_TRACE_DEBUG_ON
+    #define __tws_debug
     #define TWS_TRACE_DEBUG(sc, desc, val1, val2) \
             tws_trace(__FILE__, __func__, __LINE__, sc, desc, \
                                    (u_int64_t)val1, (u_int64_t)val2)
 #else
+    #define __tws_debug __unused
     #define TWS_TRACE_DEBUG(sc, desc, val1, val2)
 #endif