diff --git a/kdc/hprop.c b/kdc/hprop.c
index 19d6e03fd..4dbb5635e 100644
--- a/kdc/hprop.c
+++ b/kdc/hprop.c
@@ -334,10 +334,10 @@ read_block(krb5_context context, int fd, int32_t pos, void *buf, size_t len)
 	krb5_err(context, 1, errno, "lseek(%u)", 64 + pos);
     ret = read(fd, buf, len);
     if(ret < 0)
-	krb5_err(context, 1, errno, "read(%u)", len);
+	krb5_err(context, 1, errno, "read(%lu)", (unsigned long)len);
 #endif
     if(ret != len)
-	krb5_errx(context, 1, "read(%u) = %u", len, ret);
+	krb5_errx(context, 1, "read(%lu) = %u", (unsigned long)len, ret);
 }
 
 static int