diff --git a/src/View/Helper/LessHelper.php b/src/View/Helper/LessHelper.php
index 3d8570b..11a2b9a 100644
--- a/src/View/Helper/LessHelper.php
+++ b/src/View/Helper/LessHelper.php
@@ -235,6 +235,10 @@ public function compile(array $input, array $options = [], array $modify_vars =
             }
         }
 
+        if (Configure::read('debug') && !isset($options['sourceMap'])) {
+            $options['sourceMap'] = true;
+        }
+
         if ($cache) {
             $options += ['cache_dir' => $this->css_path];
             return \Less_Cache::Get($to_parse, $options, $modify_vars);
@@ -290,10 +294,6 @@ private function setOptions(array $options)
             }
         ]);
 
-        if (Configure::read('debug') && !isset($this->parser_defaults['sourceMap'])) {
-            $this->parser_defaults['sourceMap'] = true;
-        }
-
         if (empty($options['parser'])) {
             $options['parser'] = [];
         }
diff --git a/tests/TestCase/View/Helper/LessHelperTest.php b/tests/TestCase/View/Helper/LessHelperTest.php
index ab4caba..3f6da06 100644
--- a/tests/TestCase/View/Helper/LessHelperTest.php
+++ b/tests/TestCase/View/Helper/LessHelperTest.php
@@ -45,7 +45,7 @@ public function testLess()
 
         // [Less.php] Compiling using cache (here we only check for the
         // resulting tag, as the compilation checks are made in testCompile)
-        $result = $this->Less->less('less/test.less');
+        $result = $this->Less->less('less/test.less', ['parser' => ['sourceMap' => false]]);
         $this->assertHtml([
             'link' => [
                 'rel' => 'stylesheet',
@@ -54,7 +54,7 @@ public function testLess()
         ], $result);
 
         // Trying the js fallback
-        $result = $this->Less->less('less/test_error.less');
+        $result = $this->Less->less('less/test_error.less', ['parser' => ['sourceMap' => false]]);
         $this->assertHtml([
             'link' => [
                 'rel' => 'stylesheet/less',
@@ -94,7 +94,8 @@ public function testJsBlock()
     public function testCompile()
     {
         $options = [
-            'compress' => true
+            'compress' => true,
+            'sourceMap' => false
         ];
 
         // Basic compiling