Readseq/readseq.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Readseq/readseq.c b/Readseq/readseq.c
index 8af7b39..56a25ae 100644
--- a/Readseq/readseq.c
+++ b/Readseq/readseq.c
@@ -171,6 +171,7 @@ link -w -o readseq -t MPST -c 'MPS ' 
 #include <stdio.h>
 #include <string.h>
 #include <ctype.h>
+#include <stdlib.h>
 
 #include "ureadseq.h"