diff --git a/test/gtest_factor_block_difference.cpp b/test/gtest_factor_block_difference.cpp
index 65adac95533d0e14f4a16697248daa84e0bc8bd5..20bbe2c42ed27688820569a3da345596da3903f1 100644
--- a/test/gtest_factor_block_difference.cpp
+++ b/test/gtest_factor_block_difference.cpp
@@ -64,7 +64,7 @@ class FixtureFactorBlockDifference : public testing::Test
             Feat_ = FeatureBase::emplace<FeatureBase>(Cap_, "DIFF", zero3, cov);
         }
 
-        virtual void TearDown(){}
+        virtual void TearDown() override {}
 };