diff --git a/tests/boundary/filesystem/ghidraLanguageCatalogEncoding.test.ts b/tests/boundary/filesystem/ghidraLanguageCatalogEncoding.test.ts
index 2b7e5153a8..6053ddca1c 100644
--- a/tests/boundary/filesystem/ghidraLanguageCatalogEncoding.test.ts
+++ b/tests/boundary/filesystem/ghidraLanguageCatalogEncoding.test.ts
@@ -31,17 +31,17 @@ it.each([
         '"><language id="toy:LE:32:default"/></language_definitions>',
       ),
     ]),
-    expectedError: "invalid-bytes",
+    expectedError: { reason: "invalid-bytes" },
   },
   {
     name: "encoding mismatch",
     bytes: Buffer.from('<?xml version="1.0" encoding="UTF-16"?>' + xml),
-    expectedError: "encoding-mismatch",
+    expectedError: { reason: "encoding-mismatch" },
   },
   {
     name: "malformed XML alongside U+FFFD",
     bytes: Buffer.from(xml.replace('id="toy:LE:32:default"', "id=unquoted")),
-    expectedError: "malformed",
+    expectedError: { _tag: "ParseFailureError", kind: "malformed" },
   },
 ])(
   "reads $name at the language-file byte boundary",
@@ -64,8 +64,6 @@ it.each([
     else
       await expect(
         readGhidraLanguageCatalog(root, new ArtifactResourceScope()),
-      ).rejects.toMatchObject({
-        reason: expectedError,
-      });
+      ).rejects.toMatchObject(expectedError);
   },
 );