diff --git a/libs/ardour/audiosource.cc b/libs/ardour/audiosource.cc
index fb91a80661..aceb0d7036 100644
--- a/libs/ardour/audiosource.cc
+++ b/libs/ardour/audiosource.cc
@@ -1127,7 +1127,7 @@ AudioSource::compute_and_write_peaks (Sample const * buf, samplecnt_t first_samp
 		off_t target_length = blocksize * ((first_peak_byte + blocksize + 1) / blocksize);
 
 		if (endpos < target_length) {
-			DEBUG_TRACE(DEBUG::Peaks, string_compose ("Truncating Peakfile %1\n", _peakpath));
+			DEBUG_TRACE(DEBUG::Peaks, string_compose ("Truncating Peakfile A %1 to %2\n", _peakpath, target_length));
 			if (ftruncate (_peakfile_fd, target_length)) {
 				/* error doesn't actually matter so continue on without testing */
 			}
@@ -1178,7 +1178,7 @@ AudioSource::truncate_peakfile ()
 	off_t end = lseek (_peakfile_fd, 0, SEEK_END);
 
 	if (end > _peak_byte_max) {
-		DEBUG_TRACE(DEBUG::Peaks, string_compose ("Truncating Peakfile  %1\n", _peakpath));
+		DEBUG_TRACE(DEBUG::Peaks, string_compose ("Truncating Peakfile B %1 to %2\n", _peakpath, _peak_byte_max));
 		if (ftruncate (_peakfile_fd, _peak_byte_max)) {
 			error << string_compose (_("could not truncate peakfile %1 to %2 (error: %3)"),
 						 _peakpath, _peak_byte_max, errno) << endmsg;