diff --git a/core/ResponseDefinitions.php b/core/ResponseDefinitions.php
index 82421a58039..6f3380bab25 100644
--- a/core/ResponseDefinitions.php
+++ b/core/ResponseDefinitions.php
@@ -212,6 +212,7 @@ namespace OC\Core;
  *     endedAt: ?int,
  *     allowCleanup: bool,
  *     includeWatermark: bool,
+ *     userFacingErrorMessage: ?string,
  * }
  *
  * @psalm-type CoreProfileAction = array{
diff --git a/lib/public/TaskProcessing/Task.php b/lib/public/TaskProcessing/Task.php
index a2899a1f1c9..f0096c42a70 100644
--- a/lib/public/TaskProcessing/Task.php
+++ b/lib/public/TaskProcessing/Task.php
@@ -295,7 +295,7 @@ final class Task implements \JsonSerializable {
 	}
 
 	/**
-	 * @psalm-return array{id: int, lastUpdated: int, type: string, status: 'STATUS_CANCELLED'|'STATUS_FAILED'|'STATUS_SUCCESSFUL'|'STATUS_RUNNING'|'STATUS_SCHEDULED'|'STATUS_UNKNOWN', userId: ?string, appId: string, input: array<string, list<numeric|string>|numeric|string>, output: ?array<string, list<numeric|string>|numeric|string>, customId: ?string, completionExpectedAt: ?int, progress: ?float, scheduledAt: ?int, startedAt: ?int, endedAt: ?int, allowCleanup: bool, includeWatermark: bool}
+	 * @psalm-return array{id: int, lastUpdated: int, type: string, status: 'STATUS_CANCELLED'|'STATUS_FAILED'|'STATUS_SUCCESSFUL'|'STATUS_RUNNING'|'STATUS_SCHEDULED'|'STATUS_UNKNOWN', userId: ?string, appId: string, input: array<string, list<numeric|string>|numeric|string>, output: ?array<string, list<numeric|string>|numeric|string>, customId: ?string, completionExpectedAt: ?int, progress: ?float, scheduledAt: ?int, startedAt: ?int, endedAt: ?int, allowCleanup: bool, includeWatermark: bool, userFacingErrorMessage: ?string}
 	 * @since 30.0.0
 	 */
 	final public function jsonSerialize(): array {
@@ -316,6 +316,7 @@ final class Task implements \JsonSerializable {
 			'endedAt' => $this->getEndedAt(),
 			'allowCleanup' => $this->getAllowCleanup(),
 			'includeWatermark' => $this->getIncludeWatermark(),
+			'userFacingErrorMessage' => $this->getUserFacingErrorMessage(),
 		];
 	}