1 files changed, 1 insertions, 1 deletions

diff --git a/pb b/pb
index 12a366c..279bbe8 100755
--- a/pb
+++ b/pb
@@ -36,7 +36,7 @@ pb_fg() {
 
 pb_bg() {
 
-  if [ -z "$1" ] || ! pb_isuint $1 ; then
+  if [ -z "$1" ] || ! pb_isuint "$1" ; then
     return 1
   fi