diff --git a/python/ql/test/library-tests/dataflow/model-summaries/InlineTaintTest.ext.yml b/python/ql/test/library-tests/dataflow/model-summaries/InlineTaintTest.ext.yml
index 1cdfd8840dc..0fc392f9a53 100644
--- a/python/ql/test/library-tests/dataflow/model-summaries/InlineTaintTest.ext.yml
+++ b/python/ql/test/library-tests/dataflow/model-summaries/InlineTaintTest.ext.yml
@@ -18,6 +18,6 @@ extensions:
       - ["foo", "Member[MS_spread]", "Argument[0]", "ReturnValue.TupleElement[0]", "value"]
       - ["foo", "Member[MS_spread]", "Argument[1]", "ReturnValue.TupleElement[1]", "value"]
       - ["foo", "Member[MS_spread_all]", "Argument[0]", "ReturnValue.TupleElement[0,1]", "value"]
-      - ["foo", "Member[MS_Class].Call", "Argument[0, x:]", "ReturnValue", "value"]
-      - ["foo", "Member[MS_Class_transitive].Subclass.Call", "Argument[0, x:]", "ReturnValue", "value"]
+      - ["foo", "Member[MS_Class].Call", "Argument[0, x:]", "ReturnValue.Attribute[config]", "value"]
+      - ["foo", "Member[MS_Class_transitive].Subclass.Call", "Argument[0, x:]", "ReturnValue.Attribute[config]", "value"]
       - ["json", "Member[MS_loads]", "Argument[0]", "ReturnValue", "taint"]
diff --git a/python/ql/test/library-tests/dataflow/model-summaries/NormalDataflowTest.ext.yml b/python/ql/test/library-tests/dataflow/model-summaries/NormalDataflowTest.ext.yml
index 1cdfd8840dc..0fc392f9a53 100644
--- a/python/ql/test/library-tests/dataflow/model-summaries/NormalDataflowTest.ext.yml
+++ b/python/ql/test/library-tests/dataflow/model-summaries/NormalDataflowTest.ext.yml
@@ -18,6 +18,6 @@ extensions:
       - ["foo", "Member[MS_spread]", "Argument[0]", "ReturnValue.TupleElement[0]", "value"]
       - ["foo", "Member[MS_spread]", "Argument[1]", "ReturnValue.TupleElement[1]", "value"]
       - ["foo", "Member[MS_spread_all]", "Argument[0]", "ReturnValue.TupleElement[0,1]", "value"]
-      - ["foo", "Member[MS_Class].Call", "Argument[0, x:]", "ReturnValue", "value"]
-      - ["foo", "Member[MS_Class_transitive].Subclass.Call", "Argument[0, x:]", "ReturnValue", "value"]
+      - ["foo", "Member[MS_Class].Call", "Argument[0, x:]", "ReturnValue.Attribute[config]", "value"]
+      - ["foo", "Member[MS_Class_transitive].Subclass.Call", "Argument[0, x:]", "ReturnValue.Attribute[config]", "value"]
       - ["json", "Member[MS_loads]", "Argument[0]", "ReturnValue", "taint"]
diff --git a/python/ql/test/library-tests/dataflow/model-summaries/model_summaries.py b/python/ql/test/library-tests/dataflow/model-summaries/model_summaries.py
index 80af667278b..0f166772b22 100644
--- a/python/ql/test/library-tests/dataflow/model-summaries/model_summaries.py
+++ b/python/ql/test/library-tests/dataflow/model-summaries/model_summaries.py
@@ -126,19 +126,19 @@ from foo import MS_Class, MS_Class_transitive
 
 # Class summaries
 class_via_positional = MS_Class(SOURCE)
-SINK(class_via_positional)  # $ flow="SOURCE, l:-1 -> class_via_positional"
+SINK(class_via_positional.config)  # $ flow="SOURCE, l:-1 -> class_via_positional.config"
 
 class_via_kw = MS_Class(x = SOURCE)
-SINK(class_via_kw)  # $ flow="SOURCE, l:-1 -> class_via_kw"
+SINK(class_via_kw.config)  # $ flow="SOURCE, l:-1 -> class_via_kw.config"
 
 class C(MS_Class_transitive):
     pass
 
 subclass_via_positional = C(SOURCE)
-SINK(subclass_via_positional)  # $ flow="SOURCE, l:-1 -> subclass_via_positional"
+SINK(subclass_via_positional.config)  # $ flow="SOURCE, l:-1 -> subclass_via_positional.config"
 
 subclass_via_kw = C(x = SOURCE)
-SINK(subclass_via_kw)  # $ flow="SOURCE, l:-1 -> subclass_via_kw"
+SINK(subclass_via_kw.config)  # $ flow="SOURCE, l:-1 -> subclass_via_kw.config"
 
 # Modeled flow-summary is not value preserving
 from json import MS_loads as json_loads