diff --git a/t/t_openpam_readword.c b/t/t_openpam_readword.c
index ade8071..a7038a7 100644
--- a/t/t_openpam_readword.c
+++ b/t/t_openpam_readword.c
@@ -34,6 +34,7 @@
 #endif
 
 #include <err.h>
+#include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>