diff --git a/src/Serval.Client/Client.g.cs b/src/Serval.Client/Client.g.cs
index 430a6d40..4493fa95 100644
--- a/src/Serval.Client/Client.g.cs
+++ b/src/Serval.Client/Client.g.cs
@@ -3009,7 +3009,7 @@ public string BaseUrl
                         if (status_ == 409)
                         {
                             string responseText_ = ( response_.Content == null ) ? string.Empty : await response_.Content.ReadAsStringAsync().ConfigureAwait(false);
-                            throw new ServalApiException("There is already an active/pending build", status_, responseText_, headers_, null);
+                            throw new ServalApiException("There is already an active or pending build or a build in the process of being canceled", status_, responseText_, headers_, null);
                         }
                         else
                         if (status_ == 503)
diff --git a/src/Serval.Translation/Controllers/TranslationEnginesController.cs b/src/Serval.Translation/Controllers/TranslationEnginesController.cs
index 04c6c8e8..b0dfdd17 100644
--- a/src/Serval.Translation/Controllers/TranslationEnginesController.cs
+++ b/src/Serval.Translation/Controllers/TranslationEnginesController.cs
@@ -784,7 +784,7 @@ CancellationToken cancellationToken
     /// <response code="401">The client is not authenticated</response>
     /// <response code="403">The authenticated client does not own the translation engine</response>
     /// <response code="404">The engine does not exist</response>
-    /// <response code="409">There is already an active/pending build</response>
+    /// <response code="409">There is already an active or pending build or a build in the process of being canceled</response>
     /// <response code="503">A necessary service is currently unavailable. Check `/health` for more details.</response>
     [Authorize(Scopes.UpdateTranslationEngines)]
     [HttpPost("{id}/builds")]