diff --git a/libnpfs/conn.c b/libnpfs/conn.c
index e095dc51..76177b7d 100644
--- a/libnpfs/conn.c
+++ b/libnpfs/conn.c
@@ -16,6 +16,7 @@
 #include <stdio.h>
 #include <string.h>
 #include <stdint.h>
+#include <inttypes.h>
 #include <stdarg.h>
 #include <errno.h>
 #include <pthread.h>
@@ -132,8 +133,8 @@ _debug_trace (Npsrv *srv, Npfcall *fc)
 				(void)gettimeofday(&b, NULL);
 			(void)gettimeofday(&a, NULL);
 			timersub(&a, &b, &c);
-			np_logmsg(srv, "[%lu.%-3lu] %s",
-				  c.tv_sec, c.tv_usec/1000, s);
+			np_logmsg(srv, "[%"PRIdMAX".%-3"PRIdMAX"] %s",
+				  (intmax_t)c.tv_sec, (intmax_t)c.tv_usec/1000, s);
 		} else
 			np_logmsg(srv, "%s", s);
 	}
diff --git a/libnpfs/ctl.c b/libnpfs/ctl.c
index f40cde47..317a22e3 100644
--- a/libnpfs/ctl.c
+++ b/libnpfs/ctl.c
@@ -16,6 +16,7 @@
 #include <stdio.h>
 #include <string.h>
 #include <stdint.h>
+#include <inttypes.h>
 #include <stdarg.h>
 #include <pthread.h>
 #include <errno.h>
@@ -291,9 +292,9 @@ _ctl_get_date (char *name, void *a)
 		np_uerror (errno);
 		goto error;
 	}
-	if (aspf (&s, &len, "%lu.%lu %d.%d\n",
-					tv.tv_sec,         tv.tv_usec,
-					tz.tz_minuteswest, tz.tz_dsttime) < 0) {
+	if (aspf (&s, &len, "%"PRIdMAX".%"PRIdMAX" %d.%d\n",
+					(uintmax_t)tv.tv_sec, (uintmax_t)tv.tv_usec,
+					tz.tz_minuteswest,    tz.tz_dsttime) < 0) {
 		np_uerror (ENOMEM);
 		goto error;
 	}
diff --git a/utils/dioddate.c b/utils/dioddate.c
index bde002ff..f392792b 100644
--- a/utils/dioddate.c
+++ b/utils/dioddate.c
@@ -21,6 +21,7 @@
 #include <unistd.h>
 #include <stdlib.h>
 #include <stdint.h>
+#include <inttypes.h>
 #include <stdarg.h>
 #include <stdio.h>
 #if HAVE_GETOPT_H
@@ -142,11 +143,16 @@ main (int argc, char *argv[])
         errn (np_rerror (), "error reading date");
         goto done;
     }
-    if (sscanf (buf, "%lu.%lu %d.%d", &tv.tv_sec, &tv.tv_usec,
+
+    int64_t sec = 0, usec = 0;
+    if (sscanf (buf, "%"SCNd64".%"SCNd64" %d.%d", &sec, &usec,
                                     &tz.tz_minuteswest, &tz.tz_dsttime) != 4) {
         msg ("error scanning returned date: %s", buf);
         goto done;
     }
+    tv.tv_sec = sec;
+    tv.tv_usec = usec;
+
     if (Sopt) {
         if (settimeofday (&tv, &tz) < 0)
             err_exit ("settimeofday");