diff --git a/lib/assets-compiler.js b/lib/assets-compiler.js
index dc3c711..4767db9 100644
--- a/lib/assets-compiler.js
+++ b/lib/assets-compiler.js
@@ -107,11 +107,12 @@ AssetsCompiler.prototype.handleRequest = function(req, res, next) {
       , folder = match[1]
       , fileName = match[2]
       , extension = match[3]
-      , compiler = this.getCompiler(extension)
-      , sourceFolder = folder.replace(self.publicDir+compiler.destDir, self.assetDir+compiler.sourceDir)
-      , source = sourceFolder + '/' + fileName + '.' + compiler.sourceExtension;
+      , compiler = this.getCompiler(extension);
 
     if(compiler) {
+      var sourceFolder = folder.replace(self.publicDir+compiler.destDir, self.assetDir+compiler.sourceDir)
+        , source = sourceFolder + '/' + fileName + '.' + compiler.sourceExtension;
+      
       this.compileAsset(source, dest, compiler, function(err) {
         if (err) {
           throw new Error('Asset compilation failed: ' + err);