diff --git a/.coveragerc b/.coveragerc
index 7a63cb7..77f7569 100644
--- a/.coveragerc
+++ b/.coveragerc
@@ -6,7 +6,6 @@ source = tweakwcs
 exclude_lines =
     if self.debug:
     pragma: no cover
-    raise NotImplementedError
     if __name__ == .__main__.:
     @(abc\\.)?abstractmethod
     raise AssertionError