diff --git a/src/Phing/Type/AbstractFileSet.php b/src/Phing/Type/AbstractFileSet.php
index 22473ba9c..4f79254df 100644
--- a/src/Phing/Type/AbstractFileSet.php
+++ b/src/Phing/Type/AbstractFileSet.php
@@ -316,7 +316,7 @@ public function setIncludesfile(File $incl)
      *
      * @throws BuildException
      */
-    public function setExcludesfile($excl)
+    public function setExcludesfile(File $excl)
     {
         if ($this->isReference()) {
             throw $this->tooManyAttributes();