diff --git a/src/test/perl/TestLib.pm b/src/test/perl/TestLib.pm
index 3f89d753102..a377cdb226a 100644
--- a/src/test/perl/TestLib.pm
+++ b/src/test/perl/TestLib.pm
@@ -21,7 +21,6 @@ TestLib - helper module for writing PostgreSQL's C<prove> tests.
 
   # Miscellanea
   print "on Windows" if $TestLib::windows_os;
-  print "IO::Pty is available" if $TestLib::have_io_pty;
   my $path = TestLib::perl2host($backup_dir);
   ok(check_mode_recursive($stream_dir, 0700, 0600),
     "check stream dir permissions");
@@ -84,12 +83,9 @@ our @EXPORT = qw(
   command_checks_all
 
   $windows_os
-  $have_io_pty
 );
 
-our ($windows_os, $tmp_check, $log_path, $test_logfile, $have_io_pty);
-
-my @no_stdin;
+our ($windows_os, $tmp_check, $log_path, $test_logfile);
 
 BEGIN
 {
@@ -121,9 +117,6 @@ BEGIN
 		require Win32API::File;
 		Win32API::File->import(qw(createFile OsFHandleOpen CloseHandle));
 	}
-
-	eval { require IO::Pty; };
-	$have_io_pty = 1 unless $@;
 }
 
 =pod
@@ -138,12 +131,6 @@ Set to true when running under Windows, except on Cygwin.
 
 =back
 
-=item C<$have_io_pty>
-
-Set to true when IO::Pty is available.
-
-=back
-
 =cut
 
 INIT
@@ -191,20 +178,6 @@ INIT
 	autoflush STDOUT 1;
 	autoflush STDERR 1;
 	autoflush $testlog 1;
-
-	# Settings to close stdin for certain commands.
-	# If IO::Pty is present, use a pseudo-terminal, so that libraries like
-	# openssl which open the tty if they think stdin isn't one for a password
-	# don't block. Elsewhere just provide an empty string for stdin.
-	if ($have_io_pty)
-	{
-		use charnames ':full';
-		@no_stdin = ('<pty<', \"\N{END OF TRANSMISSION}");
-	}
-	else
-	{
-		@no_stdin = ('<', \"");
-	}
 }
 
 END
@@ -370,7 +343,7 @@ sub run_command
 {
 	my ($cmd) = @_;
 	my ($stdout, $stderr);
-	my $result = IPC::Run::run $cmd, '>', \$stdout, '2>', \$stderr, @no_stdin;
+	my $result = IPC::Run::run $cmd, '>', \$stdout, '2>', \$stderr;
 	chomp($stdout);
 	chomp($stderr);
 	return ($stdout, $stderr);
@@ -603,7 +576,7 @@ sub check_pg_config
 	my ($regexp) = @_;
 	my ($stdout, $stderr);
 	my $result = IPC::Run::run [ 'pg_config', '--includedir' ], '>',
-	  \$stdout, '2>', \$stderr, @no_stdin
+	  \$stdout, '2>', \$stderr
 	  or die "could not execute pg_config";
 	chomp($stdout);
 	$stdout =~ s/\r$//;
@@ -700,7 +673,7 @@ sub program_help_ok
 	my ($stdout, $stderr);
 	print("# Running: $cmd --help\n");
 	my $result = IPC::Run::run [ $cmd, '--help' ], '>', \$stdout, '2>',
-	  \$stderr, @no_stdin;
+	  \$stderr;
 	ok($result, "$cmd --help exit code 0");
 	isnt($stdout, '', "$cmd --help goes to stdout");
 	is($stderr, '', "$cmd --help nothing to stderr");
@@ -722,7 +695,7 @@ sub program_version_ok
 	my ($stdout, $stderr);
 	print("# Running: $cmd --version\n");
 	my $result = IPC::Run::run [ $cmd, '--version' ], '>', \$stdout, '2>',
-	  \$stderr, @no_stdin;
+	  \$stderr;
 	ok($result, "$cmd --version exit code 0");
 	isnt($stdout, '', "$cmd --version goes to stdout");
 	is($stderr, '', "$cmd --version nothing to stderr");
@@ -745,7 +718,8 @@ sub program_options_handling_ok
 	my ($stdout, $stderr);
 	print("# Running: $cmd --not-a-valid-option\n");
 	my $result = IPC::Run::run [ $cmd, '--not-a-valid-option' ], '>',
-	  \$stdout, '2>', \$stderr, @no_stdin;
+	  \$stdout,
+	  '2>', \$stderr;
 	ok(!$result, "$cmd with invalid option nonzero exit code");
 	isnt($stderr, '', "$cmd with invalid option prints error message");
 	return;
@@ -766,7 +740,7 @@ sub command_like
 	my ($cmd, $expected_stdout, $test_name) = @_;
 	my ($stdout, $stderr);
 	print("# Running: " . join(" ", @{$cmd}) . "\n");
-	my $result = IPC::Run::run $cmd, '>', \$stdout, '2>', \$stderr, @no_stdin;
+	my $result = IPC::Run::run $cmd, '>', \$stdout, '2>', \$stderr;
 	ok($result, "$test_name: exit code 0");
 	is($stderr, '', "$test_name: no stderr");
 	like($stdout, $expected_stdout, "$test_name: matches");
@@ -795,8 +769,7 @@ sub command_like_safe
 	my $stdoutfile = File::Temp->new();
 	my $stderrfile = File::Temp->new();
 	print("# Running: " . join(" ", @{$cmd}) . "\n");
-	my $result = IPC::Run::run $cmd, '>', $stdoutfile, '2>', $stderrfile,
-	  @no_stdin;
+	my $result = IPC::Run::run $cmd, '>', $stdoutfile, '2>', $stderrfile;
 	$stdout = slurp_file($stdoutfile);
 	$stderr = slurp_file($stderrfile);
 	ok($result, "$test_name: exit code 0");
@@ -820,7 +793,7 @@ sub command_fails_like
 	my ($cmd, $expected_stderr, $test_name) = @_;
 	my ($stdout, $stderr);
 	print("# Running: " . join(" ", @{$cmd}) . "\n");
-	my $result = IPC::Run::run $cmd, '>', \$stdout, '2>', \$stderr, @no_stdin;
+	my $result = IPC::Run::run $cmd, '>', \$stdout, '2>', \$stderr;
 	ok(!$result, "$test_name: exit code not 0");
 	like($stderr, $expected_stderr, "$test_name: matches");
 	return;
@@ -858,7 +831,7 @@ sub command_checks_all
 	# run command
 	my ($stdout, $stderr);
 	print("# Running: " . join(" ", @{$cmd}) . "\n");
-	IPC::Run::run($cmd, '>', \$stdout, '2>', \$stderr, @no_stdin);
+	IPC::Run::run($cmd, '>', \$stdout, '2>', \$stderr);
 
 	# See http://perldoc.perl.org/perlvar.html#%24CHILD_ERROR
 	my $ret = $?;