diff --git a/src/util/file_path.h b/src/util/file_path.h
index 8a2d053d8..c34c8b408 100644
--- a/src/util/file_path.h
+++ b/src/util/file_path.h
@@ -18,6 +18,7 @@ Revision History:
 --*/
 #ifndef FILE_PATH_H_
 #define FILE_PATH_H_
+#include <cstring>
 
 inline char const * get_extension(char const * file_name) {
     if (file_name == 0)