diff --git a/test/expression/distribution/discrete_unittest.cpp b/test/expression/distribution/discrete_unittest.cpp
index f097cbde..3cd50203 100644
--- a/test/expression/distribution/discrete_unittest.cpp
+++ b/test/expression/distribution/discrete_unittest.cpp
@@ -71,4 +71,4 @@ TEST_F(discrete_dist_fixture, Discrete_sampling_iter) {
     }
 }
 } // namespace expr
-} // ppl
+} // namespace ppl