diff --git a/src/fastareader.cpp b/src/fastareader.cpp
index c24668b..e1df476 100644
--- a/src/fastareader.cpp
+++ b/src/fastareader.cpp
@@ -2,6 +2,7 @@
 #include "fastareader.h"
 #include "util.h"
 #include <sstream>
+#include <string.h>
 
 FastaReader::FastaReader(string faFile, bool forceUpperCase)
 {