diff --git a/.coveragerc b/.coveragerc
index e9fb0db..ea1e099 100644
--- a/.coveragerc
+++ b/.coveragerc
@@ -2,9 +2,11 @@
 [run]
 branch = True
 source = src
-# Exclude conda internal shims that leak into coverage data
+# Exclude conda/xonsh internal shims that leak into coverage data. The phantom
+# is an absolute path like D:\a\...\config-3.py, so a bare "config-3.py" omit
+# never matches — use a glob that matches any path ending in config-<n>.py.
 omit =
-    config-3.py
+    *config-*.py
     */site-packages/*
     */conda-meta/*