diff --git a/tools/run_renderspec.sh b/tools/run_renderspec.sh
index b1e75b3bb..4ac5cd9b3 100755
--- a/tools/run_renderspec.sh
+++ b/tools/run_renderspec.sh
@@ -6,11 +6,19 @@ basedir=$1
 specdir=${basedir}/openstack/
 
 WORKSPACE=${WORKSPACE:-$basedir}
+OUTPUTDIR=$WORKSPACE/logs/
+specstyles="suse fedora"
+
+mkdir -p $OUTPUTDIR
+
+# clean up output dir
+for specstyle in $specstyles; do
+    rm -f $OUTPUTDIR/*.${specstyle}
+done
 
 echo "run renderspec over specfiles from ${specdir}"
 for spec in ${specdir}/**/*.spec.j2; do
-    mkdir -p $WORKSPACE/logs/
-    for specstyle in "suse" "fedora"; do
+    for specstyle in $specstyles; do
         echo "run ${spec} for ${specstyle}"
         renderspec --spec-style ${specstyle} ${spec} \
                    -o $WORKSPACE/logs/${spec##*/}.${specstyle}