diff --git a/common/framework/Formatter.php b/common/framework/Formatter.php
index 92bfa06d0..65d16855a 100644
--- a/common/framework/Formatter.php
+++ b/common/framework/Formatter.php
@@ -516,6 +516,7 @@ class Formatter
 
 			// Clean the content.
 			$content = utf8_clean(file_get_contents($filename));
+			$content = preg_replace('!(\n)//# (sourceMappingURL=\S+)!', '$1/* $2 */', $content);
 
 			// Append to the result string.
 			$original_filename = starts_with(\RX_BASEDIR, $filename) ? substr($filename, strlen(\RX_BASEDIR)) : $filename;
diff --git a/tests/_data/formatter/concat.source1.js b/tests/_data/formatter/concat.source1.js
index 315c8d4d5..0f738fbe0 100644
--- a/tests/_data/formatter/concat.source1.js
+++ b/tests/_data/formatter/concat.source1.js
@@ -4,3 +4,4 @@
 		$(this).attr("bar", "baz");
 	});
 })(jQuery);
+//# sourceMappingURL=concat.source1.js.map
diff --git a/tests/_data/formatter/concat.target1.js b/tests/_data/formatter/concat.target1.js
index 7ad72cf6c..d41cacb80 100644
--- a/tests/_data/formatter/concat.target1.js
+++ b/tests/_data/formatter/concat.target1.js
@@ -5,7 +5,8 @@
 		event.preventDefault();
 		$(this).attr("bar", "baz");
 	});
-})(jQuery);;
+})(jQuery);
+/* sourceMappingURL=concat.source1.js.map */;
 
 /* Original file: tests/_data/formatter/concat.source2.js */
 
diff --git a/tests/_data/formatter/concat.target2.js b/tests/_data/formatter/concat.target2.js
index 7ad72cf6c..d41cacb80 100644
--- a/tests/_data/formatter/concat.target2.js
+++ b/tests/_data/formatter/concat.target2.js
@@ -5,7 +5,8 @@
 		event.preventDefault();
 		$(this).attr("bar", "baz");
 	});
-})(jQuery);;
+})(jQuery);
+/* sourceMappingURL=concat.source1.js.map */;
 
 /* Original file: tests/_data/formatter/concat.source2.js */