diff --git a/src/im_mad/remotes/lib/probe_db.rb b/src/im_mad/remotes/lib/probe_db.rb
index 2cf4e996af..8957361b79 100644
--- a/src/im_mad/remotes/lib/probe_db.rb
+++ b/src/im_mad/remotes/lib/probe_db.rb
@@ -147,7 +147,7 @@ class VirtualMachineDB
         # ----------------------------------------------------------------------
         # check missing VMs
         # ----------------------------------------------------------------------
-        uuids = @db.execute("SELECT uuid FROM #{@dataset}").flatten!
+        uuids = @db.execute("SELECT uuid FROM #{@dataset}").flatten
         uuids ||= []
 
         (uuids - monitor_ids).each do |uuid|