diff --git a/lib/supervisor.js b/lib/supervisor.js
index be6c1e1..921ef1d 100644
--- a/lib/supervisor.js
+++ b/lib/supervisor.js
@@ -102,7 +102,7 @@ function run (args) {
             }
         }
     }
-    fileExtensionPattern = new RegExp("^.*\.(" + extensions.replace(/,/g, "|") + ")$");
+    fileExtensionPattern = new RegExp("^.*\\.(" + extensions.replace(/,/g, "|") + ")$");
 
     if (!executor) {
         executor = (programExt === "coffee" || programExt === "litcoffee") ? "coffee" : "node";