diff --git a/src/wdt.c b/src/wdt.c
index adaf6f4..876a5f0 100644
--- a/src/wdt.c
+++ b/src/wdt.c
@@ -101,12 +101,12 @@
 
 		/* No doubt now, there's no hop to recover, die loudly! */
 		break;
-
+#ifdef USE_THREAD
 	case SI_TKILL:
 		/* we got a pthread_kill, stop on it */
 		thr = tid;
 		break;
-
+#endif
 	default:
 		/* unhandled other conditions */
 		return;