diff --git a/.github/workflows/build-and-test.yml b/.github/workflows/build-and-test.yml
index 5af51c8..cc4aa14 100644
--- a/.github/workflows/build-and-test.yml
+++ b/.github/workflows/build-and-test.yml
@@ -62,4 +62,4 @@ jobs:
           xcrun xcodebuild -configuration ${{ matrix.configuration }} -scheme DummyTestee -destination 'platform=macOS' test
 
       - name: Swift Package Manager
-        run: swift test
+        run: swift test -Xswiftc -DBUILDING_WITH_SWIFT_PACKAGE_MANAGER=1
diff --git a/Tests/Tests.swift b/Tests/Tests.swift
index dca2564..54ccca9 100644
--- a/Tests/Tests.swift
+++ b/Tests/Tests.swift
@@ -28,11 +28,14 @@ struct StructsAreNotTestCases {
     XCTFail("This shouldn't run")
   }
 
+  // Work around https://github.com/apple/swift-package-manager/issues/7411
+  #if !os(Windows) && !os(Linux) || !BUILD_WITH_SWIFT_PACKAGE_MANAGER
   class NestedStructClassesCanBeTestCases: XCTestCase {
 
     func testNestedClassMethodsCanBeTests() {}
 
   }
+  #endif
 
 }
 
@@ -42,11 +45,14 @@ enum EnumsAreNotTestCases {
     XCTFail("This shouldn't run")
   }
 
+  // Work around https://github.com/apple/swift-package-manager/issues/7411
+  #if !os(Windows) && !os(Linux) || !BUILD_WITH_SWIFT_PACKAGE_MANAGER
   class NestedEnumClassesCanBeTestCases: XCTestCase {
 
     func testNestedClassMethodsCanBeTests() {}
 
   }
+  #endif
 
 }