diff --git a/substrate/wasm-runtime/build.sh b/substrate/wasm-runtime/build.sh
index 2c78bc67c7..83f46d5a04 100755
--- a/substrate/wasm-runtime/build.sh
+++ b/substrate/wasm-runtime/build.sh
@@ -1,4 +1,5 @@
 #!/bin/sh
+set -e
 
 cargo +nightly build --target=wasm32-unknown-unknown --release
 dirs=`find * -maxdepth 0 -type d | grep -v pwasm- | grep -v std`