diff --git a/extensions/less/syntaxes/LESS.tmLanguage b/extensions/less/syntaxes/LESS.tmLanguage
index 068ea8cbdd5..7393637647c 100644
--- a/extensions/less/syntaxes/LESS.tmLanguage
+++ b/extensions/less/syntaxes/LESS.tmLanguage
@@ -164,7 +164,7 @@
 		</dict>
 		<dict>
 			<key>match</key>
-			<string>(?&lt;=[\d])(px|pt|cm|mm|in|em|ex|pc)\b|%</string>
+			<string>(?&lt;=[\d])(px|pt|cm|mm|in|em|rem|ex|pc)\b|%</string>
 			<key>name</key>
 			<string>keyword.other.unit.css</string>
 		</dict>
@@ -431,4 +431,4 @@
 	<key>uuid</key>
 	<string>9343D324-75A1-4733-A5C0-5D1D4B6182D0</string>
 </dict>
-</plist>
\ No newline at end of file
+</plist>