diff --git a/build_demo_web.sh b/build_demo_web.sh
index 4fab5395e..ea267eb1b 100755
--- a/build_demo_web.sh
+++ b/build_demo_web.sh
@@ -32,4 +32,13 @@ wasm-bindgen "target/wasm32-unknown-unknown/$BUILD/$TARGET_NAME" \
 
 echo "Finished: docs/${CRATE_NAME}.wasm"
 
-open http://localhost:8888/index.html
+if [[ "$OSTYPE" == "linux-gnu"* ]]; then
+  # Linux, ex: Fedora
+  xdg-open http://localhost:8888/index.html
+elif [[ "$OSTYPE" == "msys" ]]; then
+  # Windows
+  start http://localhost:8888/index.html
+else
+  # Darmin aka MacOS or something else
+  open http://localhost:8888/index.html
+fi