diff --git a/pybwa/libbwamem_utils.c b/pybwa/libbwamem_utils.c
index d8a411b..94e1642 100644
--- a/pybwa/libbwamem_utils.c
+++ b/pybwa/libbwamem_utils.c
@@ -1,3 +1,4 @@
+#include <limits.h>
 #include "bntseq.h"
 #include "bwt.h"
 #include "kstring.h"