diff --git a/iucode_tool.c b/iucode_tool.c
index 4bba5db0fe83b8249f168d68406e8e508cdc45db..0246035bf81239972c62068f0a432c65691a7551 100644
--- a/iucode_tool.c
+++ b/iucode_tool.c
@@ -19,6 +19,7 @@
 #include <stdint.h>
 #include <sys/types.h>
 #include <sys/stat.h>
+#include <limits.h>
 #include <fcntl.h>
 #include <stdio.h>
 #include <stdlib.h>