diff --git a/lib/carto/renderer_js.js b/lib/carto/renderer_js.js
index 18d49d5..dd88cee 100644
--- a/lib/carto/renderer_js.js
+++ b/lib/carto/renderer_js.js
@@ -203,7 +203,7 @@ CartoCSS.prototype = {
           symbolizers: []
         });
         for(var u = 0; u<def.rules.length; u++){
-            if(def.rules[u].name == "marker-file" || def.rules[u].name == "point-file"){
+            if(def.rules[u].name === "marker-file" || def.rules[u].name === "point-file"){
                 var value = def.rules[u].value.value[0].value[0].value.value;
                 this.imageURLs.push(value);
             }