diff --git a/acconfig.h b/acconfig.h
index 4b1304f273..43a2e90993 100644
--- a/acconfig.h
+++ b/acconfig.h
@@ -20,9 +20,6 @@
 /** define if your system has sigwait() */
 #undef HAVE_SIGWAIT
 
-/** define if sigwait() is the UnixWare flavor */
-#undef HAVE_UNIXWARE_SIGWAIT
-
 /** define if sysconf() is available */
 #undef HAVE_SYSCONF
 
diff --git a/config.h.in b/config.h.in
index c5283ae70e..f2ad6c379e 100644
--- a/config.h.in
+++ b/config.h.in
@@ -20,9 +20,6 @@
 /** define if your system has sigwait() */
 #undef HAVE_SIGWAIT
 
-/** define if sigwait() is the UnixWare flavor */
-#undef HAVE_UNIXWARE_SIGWAIT
-
 /** define if sysconf() is available */
 #undef HAVE_SYSCONF
 
diff --git a/lib/isc/unix/app.c b/lib/isc/unix/app.c
index a02311f7fc..eb742ff030 100644
--- a/lib/isc/unix/app.c
+++ b/lib/isc/unix/app.c
@@ -423,7 +423,6 @@ isc__app_ctxrun(isc_appctx_t *ctx0) {
 				return (ISC_R_UNEXPECTED);
 			}
 
-#ifndef HAVE_UNIXWARE_SIGWAIT
 			result = sigwait(&sset, &sig);
 			if (result == 0) {
 				if (sig == SIGINT || sig == SIGTERM)
@@ -432,15 +431,6 @@ isc__app_ctxrun(isc_appctx_t *ctx0) {
 					ctx->want_reload = true;
 			}
 
-#else /* Using UnixWare sigwait semantics. */
-			sig = sigwait(&sset);
-			if (sig >= 0) {
-				if (sig == SIGINT || sig == SIGTERM)
-					ctx->want_shutdown = true;
-				else if (sig == SIGHUP)
-					ctx->want_reload = true;
-			}
-#endif /* HAVE_UNIXWARE_SIGWAIT */
 		} else {
 			/*
 			 * External, or BIND9 using multiple contexts: