diff --git a/src/write_dump.cpp b/src/write_dump.cpp
index 39c8ac2e43..e67ca27a77 100644
--- a/src/write_dump.cpp
+++ b/src/write_dump.cpp
@@ -15,6 +15,7 @@
    Contributing author:  Axel Kohlmeyer (Temple U)
 ------------------------------------------------------------------------- */
 
+#include "string.h"
 #include "write_dump.h"
 #include "style_dump.h"
 #include "dump.h"