diff --git a/peekaboo-cli/Tests/peekabooTests/JSONOutputTests.swift b/peekaboo-cli/Tests/peekabooTests/JSONOutputTests.swift
index a98fad8..5f2fe2f 100644
--- a/peekaboo-cli/Tests/peekabooTests/JSONOutputTests.swift
+++ b/peekaboo-cli/Tests/peekabooTests/JSONOutputTests.swift
@@ -283,7 +283,10 @@ struct JSONOutputTests {
 
         for errorCode in errorCodes {
             #expect(!errorCode.rawValue.isEmpty)
-            #expect(errorCode.rawValue.allSatisfy(\.isASCII))
+            let isAllASCII = errorCode.rawValue.allSatisfy { character in
+                character.isASCII
+            }
+            #expect(isAllASCII)
         }
     }
 }