diff --git a/Tests/XMLCoderTests/Minimal/BoxTreeTests.swift b/Tests/XMLCoderTests/Minimal/BoxTreeTests.swift
index a72189ac..cbd2c3eb 100644
--- a/Tests/XMLCoderTests/Minimal/BoxTreeTests.swift
+++ b/Tests/XMLCoderTests/Minimal/BoxTreeTests.swift
@@ -28,10 +28,12 @@ class BoxTreeTests: XCTestCase {
             elements: [e1, e2],
             attributes: []
         )
-
-        let boxTree = try XCTUnwrap(root.transformToBoxTree() as? KeyedBox)
-        let foo = try XCTUnwrap(boxTree.elements["foo"])
-
+        // FIXME: Use `XCTUnwrap` when commonly available
+        guard let boxTree = root.transformToBoxTree() as? KeyedBox else {
+            XCTFail("boxtTree is not a KeyedBox");
+            return
+        }
+        let foo = boxTree.elements["foo"]
         XCTAssertEqual(foo.count, 2)
     }
 }