diff --git a/src/vm/VirtualMachine.cc b/src/vm/VirtualMachine.cc
index 808016f061..b60b0079fb 100644
--- a/src/vm/VirtualMachine.cc
+++ b/src/vm/VirtualMachine.cc
@@ -3705,6 +3705,7 @@ vector<string> VirtualMachine::get_hybrid_hypervisors() const
 
     // Compatibility with old templates
 
+    attrs.clear();
     user_obj_template->get("EC2", attrs);
 
     if (!attrs.empty())