diff -rupN jack-1.9.10.org/tests/test.cpp jack-1.9.10/tests/test.cpp
--- jack-1.9.10.org/tests/test.cpp	2014-07-18 08:28:13.000000000 -0400
+++ jack-1.9.10/tests/test.cpp	2017-02-13 20:24:13.691773753 -0500
@@ -480,7 +480,7 @@ int process4(jack_nframes_t nframes, voi
 	jack_nframes_t delta_time = cur_time - last_time;
 
 	Log("calling process4 callback : jack_frame_time = %ld delta_time = %ld\n", cur_time, delta_time);
-	if (delta_time > 0  && (jack_nframes_t)abs(delta_time - cur_buffer_size) > tolerance) {
+	if (delta_time > 0  && (jack_nframes_t)abs((int64_t)delta_time - cur_buffer_size) > tolerance) {
 		printf("!!! ERROR !!! jack_frame_time seems to return incorrect values cur_buffer_size = %d, delta_time = %d tolerance %d\n", cur_buffer_size, delta_time, tolerance);
 	}