diff --git a/libraries/muParser/muParser.SlackBuild b/libraries/muParser/muParser.SlackBuild
index 6234bcf7ea..998068dfd6 100644
--- a/libraries/muParser/muParser.SlackBuild
+++ b/libraries/muParser/muParser.SlackBuild
@@ -62,12 +62,12 @@ set -e
 rm -rf $PKG
 mkdir -p $TMP $PKG $OUTPUT
 cd $TMP
-rm -rf $SRCNAM-$SRCVER
+rm -rf $SRCNAM-$VERSION
 
 if [ -e $CWD/$SRCVER.tar.gz ]; then
   tar xvf $CWD/$SRCVER.tar.gz
 else
-  tar xvf $CWD/$SRCNAM-$SRCVER.tar.gz
+  tar xvf $CWD/$SRCNAM-$VERSION.tar.gz
 fi
 
 cd $SRCNAM-$VERSION