diff --git a/wasm/build.sh b/wasm/build.sh
old mode 100644
new mode 100755
index 25f75a718..049b65065
--- a/wasm/build.sh
+++ b/wasm/build.sh
@@ -1,3 +1,11 @@
+#!/bin/sh
+
 set -e
-(cd lib; wasm-pack build --debug)
-(cd demo; npm install && node_modules/.bin/webpack-dev-server)
+(
+  cd lib
+  wasm-pack build --debug
+)
+(
+  cd demo
+  npm install && node_modules/.bin/webpack-dev-server
+)
diff --git a/wasm/release.sh b/wasm/release.sh
old mode 100644
new mode 100755
index 04db6b883..0969ba434
--- a/wasm/release.sh
+++ b/wasm/release.sh
@@ -1,4 +1,12 @@
+#!/bin/sh
+
 set -e
-(cd lib; wasm-pack build)
-(cd demo; npm install && node_modules/.bin/webpack --mode production)
+(
+  cd lib
+  wasm-pack build
+)
+(
+  cd demo
+  npm install && node_modules/.bin/webpack --mode production
+)
 echo "Output saved to demo/dist"