diff --git a/packages/core/package.json b/packages/core/package.json
index b1e1f3bcd..0f057d27b 100644
--- a/packages/core/package.json
+++ b/packages/core/package.json
@@ -62,6 +62,7 @@
 		"css-tree": "^1.1.2",
 		"css-what": "^6.1.0",
 		"emoji-regex": "^10.2.1",
+		"source-map": "0.6.1",
 		"tslib": "^2.0.0"
 	},
 	"nativescript": {