diff --git a/patchfile.gemspec b/patchfile.gemspec
index a8e6545..13b8e01 100644
--- a/patchfile.gemspec
+++ b/patchfile.gemspec
@@ -51,7 +51,7 @@ all_template.each do |folder|
       texts = File.read(filename).force_encoding('UTF-8')
       new_texts = texts.gsub(/<.*javascript_include_tag.*bootstrap.*>/,"<%= javascript_include_tag \"bootstrap.min\"%>")
       bootstrap_count = 0
-      new_texts.gsub("<%= javascript_include_tag \"bootstrap.min\"%>"){|t|
+      new_texts = new_texts.gsub("<%= javascript_include_tag \"bootstrap.min\"%>"){|t|
         bootstrap_count += 1
         (bootstrap_count > 1) ? "" : t
       }