diff --git a/internal/ceres/numeric_diff_first_order_function_test.cc b/internal/ceres/numeric_diff_first_order_function_test.cc
index 3dd6c19..dc02b13 100644
--- a/internal/ceres/numeric_diff_first_order_function_test.cc
+++ b/internal/ceres/numeric_diff_first_order_function_test.cc
@@ -33,8 +33,8 @@
 #include <memory>
 
 #include "ceres/array_utils.h"
-#inlcude "ceres/types.h"
 #include "ceres/first_order_function.h"
+#include "ceres/types.h"
 #include "gtest/gtest.h"
 
 namespace ceres::internal {