diff --git a/extensions/shaderlab/package.json b/extensions/shaderlab/package.json
index ae7e7b9fbff..9c10e6b1df9 100644
--- a/extensions/shaderlab/package.json
+++ b/extensions/shaderlab/package.json
@@ -6,7 +6,7 @@
 	"contributes": {
 		"languages": [{
 			"id": "shaderlab",
-			"extensions": [".shader"],
+			"extensions": [".shader", ".cginc"],
 			"aliases": ["ShaderLab", "shaderlab"],
 			"configuration": "./shaderlab.configuration.json"
 		}],