diff --git a/CreoManager.cpp b/CreoManager.cpp
index 60e5e08..b7bda22 100644
--- a/CreoManager.cpp
+++ b/CreoManager.cpp
@@ -489,7 +489,8 @@ int CreoManager::SafeCalculateAssemblyLevels(wfcWAssembly_ptr assembly) {
             }
         }
         
-        return max_level;
+        // Add 1 to include root assembly level, consistent with hierarchy analysis
+        return max_level + 1;
         
     }
     catch (...) {