diff --git a/.travis.yml b/.travis.yml
index ebf70cd..a45df71 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -8,7 +8,7 @@ env:
   matrix:
     - COMPOSER_FLAGS="--prefer-lowest"
     - COMPOSER_FLAGS=""
-        
+
 before_script:
   - travis_retry composer self-update
   - travis_retry composer update ${COMPOSER_FLAGS} --no-interaction --prefer-source
diff --git a/src/Updater.php b/src/Updater.php
index d17af91..82703d5 100644
--- a/src/Updater.php
+++ b/src/Updater.php
@@ -92,7 +92,7 @@ protected function convertToVersion1_0()
     {
         $isCSSfile = false;
 
-        if (in_array($this->currentFileExtension, ['css', 'scss'])) {
+        if (in_array($this->currentFileExtension, ['css', 'scss', 'less'])) {
             $isCSSfile = true;
 
             $cssChanges = [