diff --git a/kern/subr_rman.c b/kern/subr_rman.c
--- a/kern/subr_rman.c
+++ b/kern/subr_rman.c
@@ -651,7 +651,7 @@
 	struct rman		*rm;
 	struct resource		*res;
 	struct u_rman		urm;
-	struct u_resource	ures;
+	struct u_resource	ures = {};
 	int			error;
 
 	if (namelen != 3)