diff --git a/run_project_tests.py b/run_project_tests.py
index 5fc8aa2bb..088241bda 100755
--- a/run_project_tests.py
+++ b/run_project_tests.py
@@ -438,7 +438,10 @@ def validate_output(test: TestDef, stdo: str, stde: str) -> str:
 # coded to run as a batch process.
 def clear_internal_caches():
     import mesonbuild.interpreterbase
+    from mesonbuild.dependencies import CMakeDependency
+    from mesonbuild.mesonlib import PerMachine
     mesonbuild.interpreterbase.FeatureNew.feature_registry = {}
+    CMakeDependency.class_cmakeinfo = PerMachine(None, None)
 
 def run_test_inprocess(testdir):
     old_stdout = sys.stdout