diff --git a/src/test/ssl/t/001_ssltests.pl b/src/test/ssl/t/001_ssltests.pl
index b1fb15ce806..659ba9cb823 100644
--- a/src/test/ssl/t/001_ssltests.pl
+++ b/src/test/ssl/t/001_ssltests.pl
@@ -396,7 +396,7 @@ $node->connect_fails(
 note "running server tests";
 
 $common_connstr =
-  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR";
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR host=localhost";
 
 # no client cert
 $node->connect_fails(
@@ -573,7 +573,7 @@ $node->connect_fails(
 # works, iff username matches Common Name
 # fails, iff username doesn't match Common Name.
 $common_connstr =
-  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=verifydb hostaddr=$SERVERHOSTADDR";
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=verifydb hostaddr=$SERVERHOSTADDR host=localhost";
 
 $node->connect_ok(
 	"$common_connstr user=ssltestuser sslcert=ssl/client.crt sslkey=$key{'client.key'}",
@@ -600,7 +600,7 @@ $node->connect_ok(
 # intermediate client_ca.crt is provided by client, and isn't in server's ssl_ca_file
 switch_server_cert($node, 'server-cn-only', 'root_ca');
 $common_connstr =
-  "user=ssltestuser dbname=certdb sslkey=$key{'client.key'} sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=certdb sslkey=$key{'client.key'} sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR host=localhost";
 
 $node->connect_ok(
 	"$common_connstr sslmode=require sslcert=ssl/client+client_ca.crt",
diff --git a/src/test/ssl/t/002_scram.pl b/src/test/ssl/t/002_scram.pl
index 86312be88cd..d86e4b63419 100644
--- a/src/test/ssl/t/002_scram.pl
+++ b/src/test/ssl/t/002_scram.pl
@@ -53,7 +53,7 @@ configure_test_server_for_ssl($node, $SERVERHOSTADDR, $SERVERHOSTCIDR,
 switch_server_cert($node, 'server-cn-only');
 $ENV{PGPASSWORD} = "pass";
 $common_connstr =
-  "dbname=trustdb sslmode=require sslcert=invalid sslrootcert=invalid hostaddr=$SERVERHOSTADDR";
+  "dbname=trustdb sslmode=require sslcert=invalid sslrootcert=invalid hostaddr=$SERVERHOSTADDR host=localhost";
 
 # Default settings
 $node->connect_ok(
@@ -104,7 +104,7 @@ chmod 0600, "$cert_tempdir/client_scram.key"
   or die "failed to change permissions on $cert_tempdir/client_scram.key: $!";
 $client_tmp_key =~ s!\\!/!g if $PostgreSQL::Test::Utils::windows_os;
 $node->connect_fails(
-	"sslcert=ssl/client.crt sslkey=$client_tmp_key sslrootcert=invalid hostaddr=$SERVERHOSTADDR dbname=certdb user=ssltestuser channel_binding=require",
+	"sslcert=ssl/client.crt sslkey=$client_tmp_key sslrootcert=invalid hostaddr=$SERVERHOSTADDR host=localhost dbname=certdb user=ssltestuser channel_binding=require",
 	"Cert authentication and channel_binding=require",
 	expected_stderr =>
 	  qr/channel binding required, but server authenticated client without channel binding/
@@ -112,7 +112,7 @@ $node->connect_fails(
 
 # Certificate verification at the connection level should still work fine.
 $node->connect_ok(
-	"sslcert=ssl/client.crt sslkey=$client_tmp_key sslrootcert=invalid hostaddr=$SERVERHOSTADDR dbname=verifydb user=ssltestuser",
+	"sslcert=ssl/client.crt sslkey=$client_tmp_key sslrootcert=invalid hostaddr=$SERVERHOSTADDR host=localhost dbname=verifydb user=ssltestuser",
 	"SCRAM with clientcert=verify-full",
 	log_like => [
 		qr/connection authenticated: identity="ssltestuser" method=scram-sha-256/
diff --git a/src/test/ssl/t/003_sslinfo.pl b/src/test/ssl/t/003_sslinfo.pl
index 8c760b39dbf..dec0fab1611 100644
--- a/src/test/ssl/t/003_sslinfo.pl
+++ b/src/test/ssl/t/003_sslinfo.pl
@@ -67,7 +67,7 @@ configure_test_server_for_ssl($node, $SERVERHOSTADDR, $SERVERHOSTCIDR,
 switch_server_cert($node, 'server-revoked');
 
 $common_connstr =
-  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR " .
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR host=localhost " .
   "user=ssltestuser sslcert=ssl/client_ext.crt sslkey=$client_tmp_key";
 
 # Make sure we can connect even though previous test suites have established this
@@ -98,7 +98,7 @@ is($result, 't', "ssl_client_cert_present() for connection with cert");
 
 $result = $node->safe_psql("trustdb", "SELECT ssl_client_cert_present();",
   connstr => "sslrootcert=ssl/root+server_ca.crt sslmode=require " .
-  "dbname=trustdb hostaddr=$SERVERHOSTADDR user=ssltestuser");
+  "dbname=trustdb hostaddr=$SERVERHOSTADDR user=ssltestuser host=localhost");
 is($result, 'f', "ssl_client_cert_present() for connection without cert");
 
 $result = $node->safe_psql("certdb",
@@ -113,7 +113,7 @@ is($result, '3', "ssl_client_dn_field() for an invalid field");
 
 $result = $node->safe_psql("trustdb", "SELECT ssl_client_dn_field('commonName');",
   connstr => "sslrootcert=ssl/root+server_ca.crt sslmode=require " .
-  "dbname=trustdb hostaddr=$SERVERHOSTADDR user=ssltestuser");
+  "dbname=trustdb hostaddr=$SERVERHOSTADDR user=ssltestuser host=localhost");
 is($result, '', "ssl_client_dn_field() for connection without cert");
 
 $result = $node->safe_psql("certdb",