diff --git a/extensions/css/syntaxes/css.plist b/extensions/css/syntaxes/css.plist
index 5bd32faf4f6..1ebd09c0995 100644
--- a/extensions/css/syntaxes/css.plist
+++ b/extensions/css/syntaxes/css.plist
@@ -560,7 +560,7 @@
 				</dict>
 				<dict>
 					<key>begin</key>
-					<string>(blur|perspective|rect|translate(3d|X|Y|Z)?)\s*(\()</string>
+					<string>(blur|drop-shadow|perspective|rect|translate(3d|X|Y|Z)?)\s*(\()</string>
 					<key>beginCaptures</key>
 					<dict>
 						<key>1</key>