diff --git a/include/ceres/c_api.h b/include/ceres/c_api.h
index df7c9b6..91b82bf 100644
--- a/include/ceres/c_api.h
+++ b/include/ceres/c_api.h
@@ -1,5 +1,5 @@
 /* Ceres Solver - A fast non-linear least squares minimizer
- * Copyright 2015 Google Inc. All rights reserved.
+ * Copyright 2019 Google Inc. All rights reserved.
  * http://ceres-solver.org/
  *
  * Redistribution and use in source and binary forms, with or without
@@ -38,8 +38,10 @@
 #ifndef CERES_PUBLIC_C_API_H_
 #define CERES_PUBLIC_C_API_H_
 
+// clang-format off
 #include "ceres/internal/port.h"
 #include "ceres/internal/disable_warnings.h"
+// clang-format on
 
 #ifdef __cplusplus
 extern "C" {
@@ -143,4 +145,4 @@
 
 #include "ceres/internal/reenable_warnings.h"
 
-#endif  /* CERES_PUBLIC_C_API_H_ */
+#endif /* CERES_PUBLIC_C_API_H_ */