diff --git a/src/main/org/apache/tools/ant/taskdefs/Concat.java b/src/main/org/apache/tools/ant/taskdefs/Concat.java
index 81fe335c7..c3c24a9da 100644
--- a/src/main/org/apache/tools/ant/taskdefs/Concat.java
+++ b/src/main/org/apache/tools/ant/taskdefs/Concat.java
@@ -571,7 +571,7 @@ public class Concat extends Task {
             throw new BuildException("Error while concatenating: "
                                      + ioex.getMessage(), ioex);
         } finally {
-            FILE_UTILS.close(os);
+            FileUtils.close(os);
         }
     }