diff --git a/src/vmm_mad/remotes/lib/vcenter_driver/host.rb b/src/vmm_mad/remotes/lib/vcenter_driver/host.rb
index 55b588ba71..4429199223 100644
--- a/src/vmm_mad/remotes/lib/vcenter_driver/host.rb
+++ b/src/vmm_mad/remotes/lib/vcenter_driver/host.rb
@@ -712,7 +712,7 @@ module VCenterDriver
 
                 # Only take care of VMs, not templates
                 if !hashed_properties['config.template']
-                    vms[r.obj._ref + "_" + vc_uuid] = hashed_properties
+                    vms[r.obj._ref + '_' + vc_uuid] = hashed_properties
                     vm_objects << r.obj
                 end
             end
diff --git a/src/vmm_mad/remotes/lib/vcenter_driver/vi_helper.rb b/src/vmm_mad/remotes/lib/vcenter_driver/vi_helper.rb
index a8d74659dd..a406e26c64 100644
--- a/src/vmm_mad/remotes/lib/vcenter_driver/vi_helper.rb
+++ b/src/vmm_mad/remotes/lib/vcenter_driver/vi_helper.rb
@@ -117,15 +117,15 @@ module VCenterDriver
 
             return_if_error(rc, item, exit_if_fail)
         end
-        
+
         # Since https://github.com/OpenNebula/one/issues/5689
         # there two deploy_ids allowed:
         #    * moref, eg: vm-567
-        #    * moref +"_" + vcenter uuid, eg: 
-        #           2499952a-6c85-480e-b7df-4cbd2137eb69_vm-456 
+        #    * moref +"_" + vcenter uuid, eg:
+        #           2499952a-6c85-480e-b7df-4cbd2137eb69_vm-456
         # This function will always return the moref
         def self.get_deploy_id(deploy_id)
-            return deploy_id.split("_")[0]
+            deploy_id.split('_')[0]
         end
 
         def self.find_by_name(the_class, name, pool = nil, raise_if_fail = true)
diff --git a/src/vmm_mad/remotes/lib/vcenter_driver/vmm_importer.rb b/src/vmm_mad/remotes/lib/vcenter_driver/vmm_importer.rb
index 95850babb1..4e234ffb72 100644
--- a/src/vmm_mad/remotes/lib/vcenter_driver/vmm_importer.rb
+++ b/src/vmm_mad/remotes/lib/vcenter_driver/vmm_importer.rb
@@ -47,7 +47,7 @@ module VCenterDriver
             vm         = selected[:one_item]   || build
             template   = selected[:template]   || import_tmplt
             template = "DEPLOY_ID = #{vm_ref}\n" + template
-            host_id    = selected[:host]       || @list.keys[0]
+            host_id    = selected[:host] || @list.keys[0]
 
             vc_uuid    = @vi_client.vim.serviceContent.about.instanceUuid
             vc_name    = @vi_client.vim.host
diff --git a/src/vmm_mad/remotes/vcenter/deploy b/src/vmm_mad/remotes/vcenter/deploy
index cfe0ca4250..0aa093a39d 100644
--- a/src/vmm_mad/remotes/vcenter/deploy
+++ b/src/vmm_mad/remotes/vcenter/deploy
@@ -133,7 +133,7 @@ begin
         vm.poweron(set_running)
     end
 
-    puts vm['_ref'] + "_" + vc_uuid
+    puts vm['_ref'] + '_' + vc_uuid
 rescue StandardError => e
     message =  "Deploy of VM #{vm_id} on vCenter cluster #{cluster_name} " \
                "with #{dfile} failed due to \"#{e.message}\"" \