Correctly escape double quotes

app.rb

@@ -59,7 +59,7 @@ before do
 end
 
 def append_script_tag(src)
-    @inline_body_script_content <<  "<script type=\"text/javascript\" src="#{src}"></script>\n"
+    @inline_body_script_content <<  "<script type=\"text/javascript\" src=\"#{src}\"></script>\n"
 end
 
 def append_script_declaration(content)