diff --git a/src/vmm_mad/remotes/kvm/migrate b/src/vmm_mad/remotes/kvm/migrate
index 7594f11412..36151eedc4 100755
--- a/src/vmm_mad/remotes/kvm/migrate
+++ b/src/vmm_mad/remotes/kvm/migrate
@@ -252,7 +252,7 @@ begin
 
     # Compact memory
     # rubocop:disable Layout/LineLength
-    if ENV['CLEANUP_MEMORY_ON_STOP'].upcase == 'YES'
+    if ENV['CLEANUP_MEMORY_ON_STOP'].to_s.upcase == 'YES'
         `(sudo -l | grep -q sysctl) && sudo -n sysctl vm.drop_caches=3 vm.compact_memory=1 &>/dev/null &`
     end
     # rubocop:enable Layout/LineLength