diff --git a/internal/ceres/graph_test.cc b/internal/ceres/graph_test.cc
index 8f05475..2154a06 100644
--- a/internal/ceres/graph_test.cc
+++ b/internal/ceres/graph_test.cc
@@ -31,6 +31,7 @@
 #include "ceres/graph.h"
 
 #include <unordered_set>
+
 #include "gtest/gtest.h"
 
 namespace ceres {