diff --git a/CHANGES b/CHANGES
index 11abdf77ed..22f3de333d 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,3 +1,5 @@
+3310.	[test]		Increase table size for mutex profiling. [RT #28809]
+
 3309.	[bug]		resolver.c:fctx_finddone() was not threadsafe.
 			[RT #27995]
 
diff --git a/lib/isc/pthreads/mutex.c b/lib/isc/pthreads/mutex.c
index ba04f1671e..10b0a8b7e1 100644
--- a/lib/isc/pthreads/mutex.c
+++ b/lib/isc/pthreads/mutex.c
@@ -78,7 +78,7 @@ struct isc_mutexstats {
 };
 
 #ifndef ISC_MUTEX_PROFTABLESIZE
-#define ISC_MUTEX_PROFTABLESIZE (16 * 1024)
+#define ISC_MUTEX_PROFTABLESIZE (1024 * 1024)
 #endif
 static isc_mutexstats_t stats[ISC_MUTEX_PROFTABLESIZE];
 static int stats_next = 0;
@@ -200,24 +200,24 @@ isc_mutex_statsprofile(FILE *fp) {
 
 	fprintf(fp, "Mutex stats (in us)\n");
 	for (i = 0; i < stats_next; i++) {
-		fprintf(fp, "%-12s %4d: %10u  %lu.%06lu %lu.%06lu\n",
+		fprintf(fp, "%-12s %4d: %10u  %lu.%06lu %lu.%06lu %5d\n",
 			stats[i].file, stats[i].line, stats[i].count,
 			stats[i].locked_total.tv_sec,
 			stats[i].locked_total.tv_usec,
 			stats[i].wait_total.tv_sec,
-			stats[i].wait_total.tv_usec
-			);
+			stats[i].wait_total.tv_usec,
+			i);
 		for (j = 0; j < ISC_MUTEX_MAX_LOCKERS; j++) {
 			locker = &stats[i].lockers[j];
 			if (locker->file == NULL)
 				continue;
-			fprintf(fp, " %-11s %4d: %10u  %lu.%06lu %lu.%06lu\n",
+			fprintf(fp, " %-11s %4d: %10u  %lu.%06lu %lu.%06lu %5d\n",
 				locker->file, locker->line, locker->count,
 				locker->locked_total.tv_sec,
 				locker->locked_total.tv_usec,
 				locker->wait_total.tv_sec,
-				locker->wait_total.tv_usec
-				);
+				locker->wait_total.tv_usec,
+				i);
 		}
 	}
 }