diff --git a/YSFFICH.cpp b/YSFFICH.cpp
index c14f29e..45080de 100644
--- a/YSFFICH.cpp
+++ b/YSFFICH.cpp
@@ -25,7 +25,7 @@
 
 #include <cstdio>
 #include <cassert>
-
+#include <cstring>
 
 const unsigned char BIT_MASK_TABLE[] = {0x80U, 0x40U, 0x20U, 0x10U, 0x08U, 0x04U, 0x02U, 0x01U};