lib/PublicInbox/DS.pm        | 4 ++--
 lib/PublicInbox/DSdeflate.pm | 4 ++--
 lib/PublicInbox/IMAP.pm      | 2 +-
 lib/PublicInbox/NNTP.pm      | 2 +-

diff --git a/lib/PublicInbox/DS.pm b/lib/PublicInbox/DS.pm
index ef483aacf2724a4bf73a50e64223c1b40374f3f2..77e2e5e9d4a4ed0b96ab02be1f246f4c0ad76048 100644
--- a/lib/PublicInbox/DS.pm
+++ b/lib/PublicInbox/DS.pm
@@ -648,7 +648,7 @@ 	$self->close;
     }
 }
 
-sub zflush {} # overridden by DSdeflate
+sub dflush {} # overridden by DSdeflate
 sub compressed {} # overridden by DSdeflate
 sub long_response_done {} # overridden by Net::NNTP
 
@@ -682,7 +682,7 @@ sub requeue_once {
 	my ($self) = @_;
 	# COMPRESS users all share the same DEFLATE context.
 	# Flush it here to ensure clients don't see each other's data
-	$self->zflush;
+	$self->dflush;
 
 	# no recursion, schedule another call ASAP,
 	# but only after all pending writes are done.
diff --git a/lib/PublicInbox/DSdeflate.pm b/lib/PublicInbox/DSdeflate.pm
index bf0ecd3877c79295ed99c90c0e2f750f730b6bfe..639690e27f61873cf29234487bac58315b2a51d1 100644
--- a/lib/PublicInbox/DSdeflate.pm
+++ b/lib/PublicInbox/DSdeflate.pm
@@ -30,7 +30,7 @@ # global deflate context and buffer
 my ($zout, $zbuf);
 {
 	my $err;
-	$zbuf = \(my $initial = ''); # replaced by $next in zflush/write
+	$zbuf = \(my $initial = ''); # replaced by $next in dflush/write
 	($zout, $err) = Compress::Raw::Zlib::Deflate->new(
 		# nnrpd (INN) and Compress::Raw::Zlib favor MemLevel=9,
 		# the zlib C library and git use MemLevel=8 as the default
@@ -100,7 +100,7 @@ 	$err == Z_OK or die "->deflate failed $err";
 	1;
 }
 
-sub zflush ($) {
+sub dflush ($) {
 	my ($self) = @_;
 
 	my $deflated = $zbuf;
diff --git a/lib/PublicInbox/IMAP.pm b/lib/PublicInbox/IMAP.pm
index 805f1102536d99d9cf77807f86e1b0b3e6290ce4..0f0f9b3aaa6722c021132ca96224051d75b8ccc4 100644
--- a/lib/PublicInbox/IMAP.pm
+++ b/lib/PublicInbox/IMAP.pm
@@ -595,7 +595,7 @@ 		$pre = ibx_async_prefetch($ibx, $nxt->{blob},
 					\&fetch_blob_cb, $fetch_arg);
 	}
 	fetch_run_ops($self, $smsg, $bref, $ops, $partial);
-	$pre ? $self->zflush : $self->requeue_once;
+	$pre ? $self->dflush : $self->requeue_once;
 }
 
 sub emit_rfc822 {
diff --git a/lib/PublicInbox/NNTP.pm b/lib/PublicInbox/NNTP.pm
index b223eb07d417bad27115bcf5411090f4e9ab257c..791fe2a94e5b1d253a37176f8f8ccfc3f4bd2346 100644
--- a/lib/PublicInbox/NNTP.pm
+++ b/lib/PublicInbox/NNTP.pm
@@ -556,7 +556,7 @@ 	} else {
 		$self->close;
 		die "BUG: bad code: $r";
 	}
-	$self->write(\".\r\n"); # flushes (includes ->zflush)
+	$self->write(\".\r\n"); # flushes (includes ->dflush)
 	$self->requeue;
 }