diff --git a/Sources/Testing/Test+Macro.swift b/Sources/Testing/Test+Macro.swift
index 50afa755d..637256b16 100644
--- a/Sources/Testing/Test+Macro.swift
+++ b/Sources/Testing/Test+Macro.swift
@@ -568,7 +568,7 @@ public func __ifMainActorIsolationEnforced<R>(
   _ selector: __XCTestCompatibleSelector?,
   onInstanceOf type: T.Type,
   sourceLocation: SourceLocation
-) async throws -> Bool {
+) async throws -> Bool where T: ~Copyable {
   false
 }
 
diff --git a/Tests/TestingTests/NonCopyableSuiteTests.swift b/Tests/TestingTests/NonCopyableSuiteTests.swift
index 56a530199..6e70cab24 100644
--- a/Tests/TestingTests/NonCopyableSuiteTests.swift
+++ b/Tests/TestingTests/NonCopyableSuiteTests.swift
@@ -16,6 +16,7 @@ struct NonCopyableTests: ~Copyable {
   @Test borrowing func borrowMe() {}
   @Test consuming func consumeMe() {}
   @Test mutating func mutateMe() {}
+  @Test borrowing func testNotAnXCTestCaseMethod() {}
 
   @Test borrowing func typeComparison() {
     let lhs = TypeInfo(describing: Self.self)