diff --git a/src/Machine/src/Serval.Machine.Shared/Services/PreprocessBuildJob.cs b/src/Machine/src/Serval.Machine.Shared/Services/PreprocessBuildJob.cs
index 2d2e06f7..f85d35c1 100644
--- a/src/Machine/src/Serval.Machine.Shared/Services/PreprocessBuildJob.cs
+++ b/src/Machine/src/Serval.Machine.Shared/Services/PreprocessBuildJob.cs
@@ -63,7 +63,7 @@ CancellationToken cancellationToken
 
         if (trainCount == 0 && (!sourceTagInBaseModel || !targetTagInBaseModel))
         {
-            throw new InvalidOperationException(
+            throw new OperationCanceledException(
                 $"At least one language code in build {buildId} is unknown to the base model, and the data specified for training was empty. Build canceled."
             );
         }
diff --git a/src/Machine/test/Serval.Machine.Shared.Tests/Services/PreprocessBuildJobTests.cs b/src/Machine/test/Serval.Machine.Shared.Tests/Services/PreprocessBuildJobTests.cs
index 470817cc..f318524f 100644
--- a/src/Machine/test/Serval.Machine.Shared.Tests/Services/PreprocessBuildJobTests.cs
+++ b/src/Machine/test/Serval.Machine.Shared.Tests/Services/PreprocessBuildJobTests.cs
@@ -238,7 +238,7 @@ public void RunAsync_UnknownLanguageTagsNoData()
         using TestEnvironment env = new();
         ParallelCorpus corpus1 = TestEnvironment.TextFileCorpus(sourceLanguage: "xxx", targetLanguage: "zzz");
 
-        Assert.ThrowsAsync<InvalidOperationException>(async () =>
+        Assert.ThrowsAsync<OperationCanceledException>(async () =>
         {
             await env.RunBuildJobAsync(corpus1, engineId: "engine2");
         });