diff --git a/index.js b/index.js
index fda2105..7510de4 100644
--- a/index.js
+++ b/index.js
@@ -16,7 +16,7 @@ var placeholders = {
 };
 
 function matchExpressions(contents) {
-  return contents.match(/<!--\s+include:([a-z]+)\(([^)]+)\)\s+-->/);
+  return contents.match(/<!--\s+include:([a-z]+)\(([^)]+)\)\s*-->/);
 }
 
 function replaceExtension(filename, type, options) {
@@ -99,4 +99,4 @@ function gulpIncludeSource(options) {
   return stream;
 }
 
-module.exports = gulpIncludeSource;
\ No newline at end of file
+module.exports = gulpIncludeSource;