diff --git a/pmd/delete_old_dirs.bat b/pmd/delete_old_dirs.bat
index 37fa554c09..94de0bfa56 100755
--- a/pmd/delete_old_dirs.bat
+++ b/pmd/delete_old_dirs.bat
@@ -5,3 +5,4 @@ rmdir /q /s src\net\sourceforge\pmd\reports
 rmdir /q /s src\net\sourceforge\pmd\swingui\viewer
 rmdir /q /s regress\net
 rmdir /q /s regress\test\com
+rmdir /q /s concepts\