diff --git a/pmd/bin/cygwin-run.sh b/pmd/bin/cygwin-run.sh
index 20379bdf39..8e8589f702 100644
--- a/pmd/bin/cygwin-run.sh
+++ b/pmd/bin/cygwin-run.sh
@@ -6,7 +6,8 @@ esac
 FILE=$1
 FORMAT=$2
 RULESETFILES=$3
-PMD_CLASSPATH=../lib/pmd-4.0.jar:../lib/jaxen-1.1.1.jar:../lib/asm-3.0.jar
+VERSION=4.0
+PMD_CLASSPATH=../lib/pmd-$VERSION.jar:../lib/jaxen-1.1.1.jar:../lib/asm-3.0.jar
 if $cygwin; then
   FILE=`cygpath --windows "$FILE"`
   PMD_CLASSPATH=`cygpath --path --windows "$PMD_CLASSPATH"`