diff --git a/node_modules/c9/urls.js b/node_modules/c9/urls.js
index 19f9e35c..a1b000af 100644
--- a/node_modules/c9/urls.js
+++ b/node_modules/c9/urls.js
@@ -37,7 +37,7 @@ plugin.getBaseUrl = function(req, sourceBaseUrlPattern, targetBaseUrlPattern) {
     if (typeof sourceHost !== "string")
         throw new Error("Not a valid request object: " + req);
     if (!sourceBaseUrlPattern)
-        throw new Error("getBaseUrls() requires at least two arguments");
+        throw new Error("getBaseUrl() requires at least two arguments");
 
     var sourceHostMatcher = sourceBaseUrlPattern
         .replace(/^https?:\/\//, "")