diff --git a/lib/before-watchPatterns.js b/lib/before-watchPatterns.js
new file mode 100644
index 0000000..1880991
--- /dev/null
+++ b/lib/before-watchPatterns.js
@@ -0,0 +1,11 @@
+module.exports = function (hookArgs) {
+	if (hookArgs.liveSyncData && !hookArgs.liveSyncData.bundle) {
+		return (args, originalMethod) => {
+			return originalMethod().then(originalPatterns => {
+				originalPatterns.push("!app/**/*.scss");
+
+				return originalPatterns;
+			});
+		};
+	}
+}
diff --git a/src/lib/watch.js b/src/lib/watch.js
index b551419..290a80c 100644
--- a/src/lib/watch.js
+++ b/src/lib/watch.js
@@ -1,5 +1,13 @@
 var converter = require('./converter');
 
-module.exports = function (logger, projectData, usbLiveSyncService) {
+module.exports = function (logger, projectData, usbLiveSyncService, hookArgs) {
+	if (hookArgs.config) {
+		const appFilesUpdaterOptions = hookArgs.config.appFilesUpdaterOptions;
+		if (appFilesUpdaterOptions.bundle) {
+			logger.warn("Hook skipped because bundling is in progress.")
+			return;
+		}
+	}
+
 	return converter.convert(logger, projectData.projectDir, { watch: true });
 }
diff --git a/src/package.json b/src/package.json
index 54764f9..e6a8d2a 100644
--- a/src/package.json
+++ b/src/package.json
@@ -22,6 +22,11 @@
         "script": "lib/before-prepare.js",
         "inject": true
       },
+      {
+        "type": "before-watchPatterns",
+        "script": "lib/before-watchPatterns.js",
+        "inject": true
+      },
       {
         "type": "after-prepare",
         "script": "lib/after-prepare.js",