diff --git a/flavours/devstack/block-device-size.d/10-size b/flavours/devstack/block-device-size.d/10-size
index df0f0c47..9db084ef 100755
--- a/flavours/devstack/block-device-size.d/10-size
+++ b/flavours/devstack/block-device-size.d/10-size
@@ -2,7 +2,6 @@
 # Add the stack user we recommend folk use.
 
 set -e
-set -x
 
 if (( '16' '>' $IMAGE_SIZE )); then
    echo IMAGE_SIZE=16
diff --git a/lib/common-functions b/lib/common-functions
index 21eac23b..849dc72e 100644
--- a/lib/common-functions
+++ b/lib/common-functions
@@ -40,6 +40,8 @@ function check_flavour () {
 function eval_run_d () {
   local TEMP=`run_d $1`
   echo "$TEMP"
-  TEMP=`echo "$TEMP" | grep "$2"`
-  eval "$TEMP"
+  if [ `echo "$TEMP" | grep -s "$2"` ]; then
+      TEMP=`echo "$TEMP" | grep "$2"`
+      eval "$TEMP"
+  fi
 }