diff --git a/sentry_sdk/scope.py b/sentry_sdk/scope.py
index 5aac2f6ac9..722f671a12 100644
--- a/sentry_sdk/scope.py
+++ b/sentry_sdk/scope.py
@@ -279,12 +279,9 @@ def get_global_scope(cls):
 
         return _global_scope
 
-    @classmethod
-    def _merge_scopes(cls, additional_scope=None, additional_scope_kwargs=None):
+    def _merge_scopes(self, additional_scope=None, additional_scope_kwargs=None):
         # type: (Optional[Scope], Optional[Dict[str, Any]]) -> Scope
         """
-        .. versionadded:: 2.0.0
-
         Merges global, isolation and current scope into a new scope and
         adds the given additional scope or additional scope kwargs to it.
         """
@@ -302,6 +299,8 @@ def _merge_scopes(cls, additional_scope=None, additional_scope_kwargs=None):
         if current_scope is not None:
             final_scope.update_from_scope(current_scope)
 
+        final_scope.update_from_scope(self)
+
         if additional_scope is not None:
             if callable(additional_scope):
                 additional_scope(final_scope)
@@ -1042,7 +1041,7 @@ def capture_event(self, event, hint=None, scope=None, **scope_kwargs):
 
         :returns: An `event_id` if the SDK decided to send the event (see :py:meth:`sentry_sdk.client._Client.capture_event`).
         """
-        scope = Scope._merge_scopes(scope, scope_kwargs)
+        scope = self._merge_scopes(scope, scope_kwargs)
 
         return Scope.get_client().capture_event(event=event, hint=hint, scope=scope)