diff --git a/.coveragerc b/.coveragerc
index 19ce464b9f2..71fc7c0646a 100644
--- a/.coveragerc
+++ b/.coveragerc
@@ -1,5 +1,6 @@
 # .coveragerc to control coverage.py
 [run]
+plugins = Cython.Coverage
 branch = True
 source =
     rmgpy