diff --git a/internal/ceres/split.h b/internal/ceres/split.h
index 94b773d..f513023 100644
--- a/internal/ceres/split.h
+++ b/internal/ceres/split.h
@@ -33,6 +33,7 @@
 
 #include <string>
 #include <vector>
+
 #include "ceres/internal/port.h"
 
 namespace ceres {
@@ -41,7 +42,8 @@
 // Split a string using one or more character delimiters, presented as a
 // nul-terminated c string. Append the components to 'result'. If there are
 // consecutive delimiters, this function skips over all of them.
-void SplitStringUsing(const std::string& full, const char* delim,
+void SplitStringUsing(const std::string& full,
+                      const char* delim,
                       std::vector<std::string>* res);
 
 }  // namespace internal