diff --git a/nnvm b/nnvm
index 7c603eb3083d..31920d7c0ccc 160000
--- a/nnvm
+++ b/nnvm
@@ -1 +1 @@
-Subproject commit 7c603eb3083d809d6b15a703f5019601d6597277
+Subproject commit 31920d7c0ccc9239561311cd1e568ea82bbe572b