diff --git a/rosapi/src/rosapi/objectutils.py b/rosapi/src/rosapi/objectutils.py
index 539b7ac4d..1337f46d8 100644
--- a/rosapi/src/rosapi/objectutils.py
+++ b/rosapi/src/rosapi/objectutils.py
@@ -37,6 +37,10 @@
 
 from rosapi.stringify_field_types import stringify_field_types
 from rosbridge_library.internal import ros_loader
+from rosbridge_library.internal.ros_loader import (
+    InvalidClassException,
+    InvalidModuleException,
+)
 
 # Keep track of atomic types and special types
 atomics = [