diff --git a/lib/Service/MetadataService.php b/lib/Service/MetadataService.php
index 36ccc833..5c0daddc 100644
--- a/lib/Service/MetadataService.php
+++ b/lib/Service/MetadataService.php
@@ -85,7 +85,8 @@ public function getEnrichedProviders(): array {
 	}
 
 	private function getIdFromSource(string $sourceId): string {
-		if (!preg_match('/^[^: ]+__[^: ]+: (\d+)$/', $sourceId, $matches)) {
+		// note the ":" in the item id part
+		if (!preg_match('/^[a-zA-Z0-9_-]+__[a-zA-Z0-9_-]+: ([a-zA-Z0-9:-])+$/', $sourceId, $matches)) {
 			throw new \InvalidArgumentException("Invalid source id $sourceId");
 		}
 		return $matches[1];