diff --git a/source3/rpc_server/srv_pipe.c b/source3/rpc_server/srv_pipe.c
index fecbae2362c..74e00e5388e 100644
--- a/source3/rpc_server/srv_pipe.c
+++ b/source3/rpc_server/srv_pipe.c
@@ -937,7 +937,7 @@ err:
 static bool api_pipe_alter_context(struct pipes_struct *p,
 					struct ncacn_packet *pkt)
 {
-	struct dcerpc_auth auth_info;
+	struct dcerpc_auth auth_info = {0};
 	uint16 assoc_gid;
 	NTSTATUS status;
 	union dcerpc_payload u;