diff --git a/htsutils.h b/htsutils.h
index ff7262d..5a76528 100644
--- a/htsutils.h
+++ b/htsutils.h
@@ -11,6 +11,7 @@
 
 #include <stdio.h>
 #include <stdlib.h>
+#include <stdint.h>
 #include <ctype.h>
 
 #include <htslib/tbx.h>