diff --git a/python/ql/test/library-tests/frameworks/data/test.expected b/python/ql/test/library-tests/frameworks/data/test.expected
index 591b5286b63..6c23dc276de 100644
--- a/python/ql/test/library-tests/frameworks/data/test.expected
+++ b/python/ql/test/library-tests/frameworks/data/test.expected
@@ -30,7 +30,7 @@ isSink
 | test.py:33:22:33:24 | ControlFlowNode for one | test-source |
 | test.py:33:27:33:29 | ControlFlowNode for two | test-source |
 | test.py:33:32:33:36 | ControlFlowNode for three | test-source |
-| test.py:57:7:57:12 | ControlFlowNode for ArgPos | test-source |
+| test.py:57:27:57:33 | ControlFlowNode for arg_pos | test-source |
 | test.py:66:17:66:20 | ControlFlowNode for arg1 | test-source |
 | test.py:66:23:66:26 | ControlFlowNode for arg2 | test-source |
 | test.py:66:34:66:43 | ControlFlowNode for namedThing | test-source |
diff --git a/python/ql/test/library-tests/frameworks/data/test.py b/python/ql/test/library-tests/frameworks/data/test.py
index 4064d1a808f..a037ddba9a2 100644
--- a/python/ql/test/library-tests/frameworks/data/test.py
+++ b/python/ql/test/library-tests/frameworks/data/test.py
@@ -54,7 +54,7 @@ val = inst.foo()
 
 from testlib import ArgPos
 
-val = ArgPos.selfThing(arg, named=2)
+arg_pos = ArgPos(); val = arg_pos.self_thing(arg, named=2);
 
 class SubClass (ArgPos.MyClass):
     def foo(self, arg, named=2, otherName=3):
@@ -95,4 +95,4 @@ from foo1.bar import baz1
 baz1(baz1) # no match, and that's the point.
 
 from foo2.bar import baz2
-baz2(baz2) # match
\ No newline at end of file
+baz2(baz2) # match
diff --git a/python/ql/test/library-tests/frameworks/data/test.ql b/python/ql/test/library-tests/frameworks/data/test.ql
index 4b585309a6a..cc056058514 100644
--- a/python/ql/test/library-tests/frameworks/data/test.ql
+++ b/python/ql/test/library-tests/frameworks/data/test.ql
@@ -44,7 +44,7 @@ class Sinks extends ModelInput::SinkModelCsv {
         "testlib;;Member[CallFilter].Member[arityOne].WithArity[1].Argument[any];test-source", //
         "testlib;;Member[CallFilter].Member[twoOrMore].WithArity[2..].Argument[0..];test-source", //
         // testing non-positional arguments
-        "testlib;;Member[ArgPos].Member[selfThing].Argument[self];test-source", //
+        "testlib;;Member[ArgPos].Instance.Member[self_thing].Argument[self];test-source", //
         // any argument
         "testlib;;Member[ArgPos].Member[anyParam].Argument[any];test-source", //
         "testlib;;Member[ArgPos].Member[anyNamed].Argument[any-named];test-source", //