diff --git a/sys/dev/bhnd/siba/siba_subr.c b/sys/dev/bhnd/siba/siba_subr.c
index 555c6034d4ea..e688006c2c66 100644
--- a/sys/dev/bhnd/siba/siba_subr.c
+++ b/sys/dev/bhnd/siba/siba_subr.c
@@ -187,6 +187,11 @@ siba_dinfo_get_port(struct siba_devinfo *dinfo, bhnd_port_type port_type,
 		return (NULL);
 	case BHND_PORT_AGENT:
 		return (NULL);
+	default:
+		printf("%s: unknown port_type (%d)\n",
+		    __func__,
+		    port_type);
+		return (NULL);
 	}
 }
 
@@ -369,4 +374,4 @@ siba_parse_admatch(uint32_t am, uint32_t *addr, uint32_t *size)
 	}
 
 	return (0);
-}
\ No newline at end of file
+}