diff --git a/app/models/manager_refresh/inventory_collection/builder.rb b/app/models/manager_refresh/inventory_collection/builder.rb
index 8200842a2292..0b06e61ad735 100644
--- a/app/models/manager_refresh/inventory_collection/builder.rb
+++ b/app/models/manager_refresh/inventory_collection/builder.rb
@@ -80,7 +80,7 @@ def construct_data
       # Creates InventoryCollection
       def to_inventory_collection
         if @properties[:model_class].nil? && !@options[:without_model_class]
-          raise MissingModelClassError
+          raise MissingModelClassError, "Missing model_class for :#{@name} (\"#{@name.to_s.classify}\" or subclass expected)."
         end
 
         ::ManagerRefresh::InventoryCollection.new(to_hash)
diff --git a/spec/models/manager_refresh/inventory_collection/builder_spec.rb b/spec/models/manager_refresh/inventory_collection/builder_spec.rb
index 45a5cc649dd6..94cdcfebcf98 100644
--- a/spec/models/manager_refresh/inventory_collection/builder_spec.rb
+++ b/spec/models/manager_refresh/inventory_collection/builder_spec.rb
@@ -58,7 +58,7 @@ def create_persister
   it 'throws exception if model_class not specified' do
     builder = cloud.prepare_data(:non_existing_ic, persister_class)
 
-    expect { builder.to_inventory_collection }.to raise_error(::ManagerRefresh::InventoryCollection::Builder::MissingModelClassError)
+    expect { builder.to_inventory_collection }.to raise_error(::ManagerRefresh::InventoryCollection::Builder::MissingModelClassError, /NonExistingIc/)
   end
 
   # --- adv. settings (TODO: link to gui)---