diff --git a/scripts/_helpers.py b/scripts/_helpers.py
index 30775ae5..f1e5e887 100644
--- a/scripts/_helpers.py
+++ b/scripts/_helpers.py
@@ -240,7 +240,7 @@ def mock_snakemake(rulename, **wildcards):
         if os.path.exists(p):
             snakefile = p
             break
-    workflow = sm.Workflow(snakefile)
+    workflow = sm.Workflow(snakefile, overwrite_configfiles=[])
     workflow.include(snakefile)
     workflow.global_resources = {}
     rule = workflow.get_rule(rulename)