diff --git a/jedi/dynamic.py b/jedi/dynamic.py
index 92c95dfb..325946bb 100644
--- a/jedi/dynamic.py
+++ b/jedi/dynamic.py
@@ -526,7 +526,7 @@ def check_statement_information(stmt, search_name):
         # this might be removed if we analyze and, etc
         assert len(commands) == 1
         call = commands[0]
-        assert isinstance(call, pr.Call) and str(call.name) == 'isinstance'
+        assert type(call) is pr.Call and str(call.name) == 'isinstance'
         assert bool(call.execution)
 
         # isinstance check
diff --git a/jedi/evaluate_representation.py b/jedi/evaluate_representation.py
index ab12b1ab..d9967c96 100644
--- a/jedi/evaluate_representation.py
+++ b/jedi/evaluate_representation.py
@@ -643,7 +643,7 @@ class Execution(Executable):
                             call = key_stmt.get_commands()[0]
                             if isinstance(call, pr.Name):
                                 yield call, value_stmt
-                            elif isinstance(call, pr.Call):
+                            elif type(call) is pr.Call:
                                 yield call.name, value_stmt
                 # Normal arguments (including key arguments).
                 else: