--- a/ppstest.c
+++ b/ppstest.c
@@ -110,13 +110,13 @@ retry:
 	}
 
 	printf("source %d - "
-	       "assert %ld.%09ld, sequence: %ld - "
-	       "clear  %ld.%09ld, sequence: %ld\n",
+	       "assert %lld.%09ld, sequence: %ld - "
+	       "clear  %lld.%09ld, sequence: %ld\n",
 	       i,
-	       infobuf.assert_timestamp.tv_sec,
+	       (long long)infobuf.assert_timestamp.tv_sec,
 	       infobuf.assert_timestamp.tv_nsec,
 	       infobuf.assert_sequence,
-	       infobuf.clear_timestamp.tv_sec,
+	       (long long)infobuf.clear_timestamp.tv_sec,
 	       infobuf.clear_timestamp.tv_nsec, infobuf.clear_sequence);
 	fflush(stdout);
 
--- a/ppswatch.c
+++ b/ppswatch.c
@@ -145,7 +145,7 @@ int fetch_source(pps_handle_t handle, in
 	if (max_divergence < div)
 		max_divergence = div;
 	if (div >= margin) {
-		printf("timestamp: %ld, sequence: %ld, offset: % 6ld\n", ts.tv_sec, seq, ts.tv_nsec);
+		printf("timestamp: %lld, sequence: %ld, offset: % 6ld\n", (long long)ts.tv_sec, seq, ts.tv_nsec);
 		fflush(stdout);
 		overflows++;
 		curr_unsync++;