diff --git a/lib/OpenQA/Schema/Result/ScheduledProducts.pm b/lib/OpenQA/Schema/Result/ScheduledProducts.pm
index ef2f5656eabd..b71cc98f1603 100644
--- a/lib/OpenQA/Schema/Result/ScheduledProducts.pm
+++ b/lib/OpenQA/Schema/Result/ScheduledProducts.pm
@@ -255,7 +255,8 @@ sub _schedule_iso {
     for my $asset (values %{parse_assets_from_settings($args)}) {
         my ($name, $type) = ($asset->{name}, $asset->{type});
         return {error => 'Asset type and name must not be empty.'} unless $name && $type;
-        return {error => "Failed to register asset $name."} unless $assets->register($type, $name, {missing_ok => 1});
+        return {error => "Failed to register asset $name."}
+          unless $assets->register($type, $name, {missing_ok => 1, refresh_size => 1});
     }
 
     # read arguments for deprioritization and obsoleten
diff --git a/t/39-scheduled_products-table.t b/t/39-scheduled_products-table.t
index 6a5f12a0a633..88593026b646 100644
--- a/t/39-scheduled_products-table.t
+++ b/t/39-scheduled_products-table.t
@@ -71,6 +71,17 @@ subtest 'handling assets with invalid name' => sub {
 
 is $scheduled_product->schedule_iso(\%settings), undef, 'scheduling the same product again prevented';
 
+subtest 'asset registration on scheduling' => sub {
+    $schema->storage->dbh->prepare('delete from assets where name = ? ')->execute('dvdsize42.iso');
+    is $schema->resultset('Assets')->find({type => 'iso', name => 'dvdsize42.iso'}), undef,
+      'dvdsize42.iso is not known yet';
+    $scheduled_product = $scheduled_products->create(\%settings);
+    $scheduled_product->schedule_iso({ISO => 'dvdsize42.iso'});
+    is $schema->resultset('Assets')->find({type => 'iso', name => 'dvdsize42.iso'})->size, 42,
+      'dvdsize42.iso has known size';
+    $scheduled_product->discard_changes;
+};
+
 my $test_job = $scheduled_product->jobs->create({TEST => 'testjob'});
 subtest 'cancellation after product has been scheduled' => sub {
     is $scheduled_product->cancel('test reason 1'), 1, 'cancel returns the number of affected jobs';
diff --git a/t/data/openqa/share/factory/iso/dvdsize42.iso b/t/data/openqa/share/factory/iso/dvdsize42.iso
new file mode 100644
index 000000000000..c5666ccc0abb
--- /dev/null
+++ b/t/data/openqa/share/factory/iso/dvdsize42.iso
@@ -0,0 +1 @@
+this asset file is exactly 42 bytes long!