diff --git a/src/test/perl/PostgreSQL/Test/BackgroundPsql.pm b/src/test/perl/PostgreSQL/Test/BackgroundPsql.pm
index 5bd41a278dd..1a77eae8d84 100644
--- a/src/test/perl/PostgreSQL/Test/BackgroundPsql.pm
+++ b/src/test/perl/PostgreSQL/Test/BackgroundPsql.pm
@@ -155,11 +155,11 @@ sub wait_connect
 	#
 	# See query() for details about why/how the banner is used.
 	my $banner = "background_psql: ready";
-	my $banner_match = qr/(^|\n)$banner\r?\n/;
+	my $banner_match = qr/(^|\n)(?!\\echo|\\warn).*$banner\r?\n/;
 	$self->{stdin} .= "\\echo $banner\n\\warn $banner\n";
 	$self->{run}->pump()
 	  until ($self->{stdout} =~ /$banner_match/
-		  && $self->{stderr} =~ /$banner\r?\n/)
+		  && $self->{stderr} =~ /$banner_match/)
 	  || $self->{timeout}->is_expired;
 
 	note "connect output:\n",
@@ -270,7 +270,7 @@ sub query
 	# to be careful that we don't e.g. match the echoed \echo command, rather
 	# than its output.
 	my $banner = "background_psql: QUERY_SEPARATOR $query_cnt:";
-	my $banner_match = qr/(^|\n)$banner\r?\n/;
+	my $banner_match = qr/(^|\n)(?!\\echo|\\warn).*$banner\r?\n/;
 	$self->{stdin} .= "$query\n;\n\\echo $banner\n\\warn $banner\n";
 	pump_until(
 		$self->{run}, $self->{timeout},