diff --git a/.github/workflows/compatibility_tests.yml b/.github/workflows/compatibility_tests.yml
index 5045db9c..c18b3656 100644
--- a/.github/workflows/compatibility_tests.yml
+++ b/.github/workflows/compatibility_tests.yml
@@ -32,12 +32,14 @@ jobs:
       - name: Run compatibility tests on OpenSwiftUI + macOS
         run: |
           swift test \
+            --filter OpenSwiftUICompatibilityTests \
             --build-path .build-compatibility-test-debug
         env:
           OPENSWIFTUI_COMPATIBILITY_TEST: 0
       - name: Run compatibility tests on SwiftUI + macOS
         run: |
           swift test \
+            --filter OpenSwiftUICompatibilityTests \
             --build-path .build-compatibility-test-debug
         env:
           OPENSWIFTUI_COMPATIBILITY_TEST: 1
@@ -69,6 +71,7 @@ jobs:
         run: swift --version
       - name: Run compatibility tests on OpenSwiftUI + iOS
         run: |
+          # FIXME: xcodebuild will run all test targets.
           xcodebuild test \
           -scheme OpenSwiftUI \
           -configuration Debug \
diff --git a/Sources/OpenSwiftUICore/Log/Signpost.swift b/Sources/OpenSwiftUICore/Log/Signpost.swift
index 213bf933..d9b749ee 100644
--- a/Sources/OpenSwiftUICore/Log/Signpost.swift
+++ b/Sources/OpenSwiftUICore/Log/Signpost.swift
@@ -123,6 +123,7 @@ package struct Signpost {
         guard isEnabled else {
             return closure()
         }
+        #if canImport(Darwin)
         let id = OSSignpostID.makeExclusiveID(object)
         switch style {
         case let .kdebug(code):
@@ -138,6 +139,9 @@ package struct Signpost {
             defer { os_signpost(.end, log: _signpostLog, name: name, signpostID: id) }
             return closure()
         }
+        #else
+        return closure()
+        #endif
     }
     
     @_transparent
@@ -150,6 +154,7 @@ package struct Signpost {
         guard isEnabled else {
             return closure()
         }
+        #if canImport(Darwin)
         let id = OSSignpostID.makeExclusiveID(object)
         switch style {
         case let .kdebug(code):
@@ -161,6 +166,9 @@ package struct Signpost {
             defer { os_signpost(.end, log: _signpostLog, name: name, signpostID: id) }
             return closure()
         }
+        #else
+        return closure()
+        #endif
     }
     
     @_transparent
diff --git a/Sources/OpenSwiftUICore/Util/ThreadUtils.swift b/Sources/OpenSwiftUICore/Util/ThreadUtils.swift
index 7a0987da..4301fed9 100644
--- a/Sources/OpenSwiftUICore/Util/ThreadUtils.swift
+++ b/Sources/OpenSwiftUICore/Util/ThreadUtils.swift
@@ -5,7 +5,7 @@
 //  Audited for RELEASE_2024
 //  Status: Complete
 
-@preconcurrency import Foundation
+import Foundation
 
 final package class ThreadSpecific<T> {
     var key: pthread_key_t
@@ -68,7 +68,9 @@ package func onMainThread(do body: @escaping () -> Void) {
 }
 
 package func mainThreadPrecondition() {
+    #if !os(WASI)
     guard Thread.isMainThread else {
         fatalError("calling into OpenSwiftUI on a non-main thread is not supported")
     }
+    #endif
 }