diff --git a/man8/zdump.8 b/man8/zdump.8
index 1438cd4d0..81c6c64c8 100644
--- a/man8/zdump.8
+++ b/man8/zdump.8
@@ -216,7 +216,7 @@ and
 output,
 .q "UT"
 denotes the value returned by
-.IR gmtime (3),
+.BR gmtime (3),
 which uses UTC for modern timestamps and some other UT flavor for
 timestamps that predate the introduction of UTC.
 No attempt is currently made to have the output use