diff --git a/t/pt-online-schema-change/pt-153.t b/t/pt-online-schema-change/pt-153.t
index 26691c06..4bb1c242 100644
--- a/t/pt-online-schema-change/pt-153.t
+++ b/t/pt-online-schema-change/pt-153.t
@@ -26,7 +26,7 @@ require "$trunk/bin/pt-online-schema-change";
 my $dp = new DSNParser(opts=>$dsn_opts);
 my $sb = new Sandbox(basedir => '/tmp', DSNParser => $dp);
 my $source_dbh = $sb->get_dbh_for('source');
-my $source_dsn = 'h=127.1,P=12345,u=msandbox,p=msandbox';
+my $source_dsn = 'h=127.1,P=12345,u=msandbox,p=msandbox,s=1';
 
 if ( !$source_dbh ) {
    plan skip_all => 'Cannot connect to sandbox source';
diff --git a/t/pt-online-schema-change/pt-200.t b/t/pt-online-schema-change/pt-200.t
index 643cc544..441fd998 100644
--- a/t/pt-online-schema-change/pt-200.t
+++ b/t/pt-online-schema-change/pt-200.t
@@ -26,7 +26,7 @@ require "$trunk/bin/pt-online-schema-change";
 my $dp = new DSNParser(opts=>$dsn_opts);
 my $sb = new Sandbox(basedir => '/tmp', DSNParser => $dp);
 my $source_dbh = $sb->get_dbh_for('source');
-my $source_dsn = 'h=127.1,P=12345,u=msandbox,p=msandbox';
+my $source_dsn = 'h=127.1,P=12345,u=msandbox,p=msandbox,s=1';
 
 if ( !$source_dbh ) {
    plan skip_all => 'Cannot connect to sandbox source';