diff --git a/python3/packages/observer.py b/python3/packages/observer.py
index ad41b89848f..f2058e4ed4c 100644
--- a/python3/packages/observer.py
+++ b/python3/packages/observer.py
@@ -314,7 +314,7 @@ def autoinstrument_class(aclass):
                         continue
 
                     with t.start_as_current_span(
-                        f"class.instrument:{module_name}.{method_name}={method}"
+                        f"class.instrument:{module_name}.{method_name}"
                     ):
                         # Avoid RecursionError:
                         # 'maximum recursion depth exceeded in comparison'