diff --git a/src/rx/UKERNEL/rx_knet.c b/src/rx/UKERNEL/rx_knet.c
index b7c4962055..b2eac23cbd 100644
--- a/src/rx/UKERNEL/rx_knet.c
+++ b/src/rx/UKERNEL/rx_knet.c
@@ -161,6 +161,7 @@ rx_ServerProc(void *unused)
 	/* assert(newcall != NULL); */
     }
     AFS_GLOCK();
+    return NULL;
 }
 
 /*