diff --git a/plugins/localdump/mysql.sh b/plugins/localdump/mysql.sh
index d66b70e6c4ebeb430071b955f70b65b0ddb7ee8a..5f9d81af0a4dce119479d5021044915457a08488 100755
--- a/plugins/localdump/mysql.sh
+++ b/plugins/localdump/mysql.sh
@@ -28,10 +28,10 @@ fi
 mysql_FOUND=0
 
 # counters
-mysql_COUNT_CREATE=0
-mysql_COUNT_DUMPS=0
-mysql_COUNT_DB=0
-mysql_COUNT_ERRORS=0
+typeset -i mysql_COUNT_CREATE=0
+typeset -i mysql_COUNT_DUMPS=0
+typeset -i mysql_COUNT_DB=0
+typeset -i mysql_COUNT_ERRORS=0
 
 SOURCE_DIR=/var/lib/mysql