diff --git a/build/tools/proc_count.sh b/build/tools/proc_count.sh
index 7b10dbe0ac..65109b41dd 100755
--- a/build/tools/proc_count.sh
+++ b/build/tools/proc_count.sh
@@ -14,5 +14,4 @@ case `uname` in
         ;;
 esac
 
-((wxPROC_COUNT++))
-echo $wxPROC_COUNT
+echo $((wxPROC_COUNT+1))