diff --git a/src/Uno.Wasm.Bootstrap/build/scripts/emscripten-setup.cmd b/src/Uno.Wasm.Bootstrap/build/scripts/emscripten-setup.cmd
index 43bc39bd..caf68743 100644
--- a/src/Uno.Wasm.Bootstrap/build/scripts/emscripten-setup.cmd
+++ b/src/Uno.Wasm.Bootstrap/build/scripts/emscripten-setup.cmd
@@ -23,6 +23,7 @@ IF NOT EXIST "%UNO_EMSDK_PATH_MARKER%" (
 
 	IF ERRORLEVEL 1 ( 
 		echo Python is not installed. You can install it from the store https://www.microsoft.com/store/productId/9P7QFQMJRFP7  1>&2
+		EXIT /B 1
 	) ELSE (
 		echo "Installing emscripten %UNO_EMSDK_VERSION% in %UNO_EMSDK_PATH%"