diff --git a/stdlib/public/Concurrency/CMakeLists.txt b/stdlib/public/Concurrency/CMakeLists.txt
index 8be0d0237396d..3ca643444ae69 100644
--- a/stdlib/public/Concurrency/CMakeLists.txt
+++ b/stdlib/public/Concurrency/CMakeLists.txt
@@ -78,8 +78,8 @@ set(SWIFT_RUNTIME_CONCURRENCY_C_SOURCES
   Actor.cpp
   AsyncLet.cpp
   Clock.cpp
-  GlobalExecutor.cpp
   ConcurrencyHooks.cpp
+  GlobalExecutor.cpp
   EmbeddedSupport.cpp
   Error.cpp
   ExecutorBridge.cpp
@@ -196,10 +196,6 @@ else()
   )
 endif()
 
-set(SWIFT_RUNTIME_CONCURRENCY_EMBEDDED_SWIFT_SOURCES
-  PlatformExecutorNone.swift
-  )
-
 set(LLVM_OPTIONAL_SOURCES
   DispatchGlobalExecutor.cpp
   CooperativeGlobalExecutor.cpp
@@ -315,6 +311,20 @@ if(SWIFT_SHOULD_BUILD_EMBEDDED_STDLIB AND SWIFT_SHOULD_BUILD_EMBEDDED_CONCURRENC
       endif()
     endif()
 
+    if("${arch}" MATCHES "wasm32")
+      set(SWIFT_RUNTIME_CONCURRENCY_EMBEDDED_SWIFT_SOURCES
+        ExecutorImpl.swift
+        PlatformExecutorCooperative.swift
+      )
+      list(APPEND SWIFT_RUNTIME_CONCURRENCY_C_SOURCES
+        ExecutorImpl.cpp
+      )
+    else()
+      set(SWIFT_RUNTIME_CONCURRENCY_EMBEDDED_SWIFT_SOURCES
+        PlatformExecutorNone.swift
+      )
+    endif()
+
     set(SWIFT_SDK_embedded_THREADING_PACKAGE none)
     set(SWIFT_SDK_embedded_ARCH_${arch}_MODULE "${mod}")
     set(SWIFT_SDK_embedded_ARCH_${mod}_MODULE "${mod}")
diff --git a/stdlib/public/Concurrency/Executor.swift b/stdlib/public/Concurrency/Executor.swift
index 6b380f7f6dd3c..bbba040a1336b 100644
--- a/stdlib/public/Concurrency/Executor.swift
+++ b/stdlib/public/Concurrency/Executor.swift
@@ -610,7 +610,7 @@ func _createDefaultExecutors() {
   }
 }
 
-#if !$Embedded && !SWIFT_STDLIB_TASK_TO_THREAD_MODEL_CONCURRENCY
+#if os(WASI) || (!$Embedded && !SWIFT_STDLIB_TASK_TO_THREAD_MODEL_CONCURRENCY)
 extension MainActor {
   @available(StdlibDeploymentTarget 6.2, *)
   static var _executor: (any MainExecutor)? = nil
@@ -627,7 +627,7 @@ extension MainActor {
     return _executor!
   }
 }
-#endif // !$Embedded && !SWIFT_STDLIB_TASK_TO_THREAD_MODEL_CONCURRENCY
+#endif // os(WASI) || (!$Embedded && !SWIFT_STDLIB_TASK_TO_THREAD_MODEL_CONCURRENCY)
 
 extension Task where Success == Never, Failure == Never {
   @available(StdlibDeploymentTarget 6.2, *)
diff --git a/stdlib/public/Concurrency/ExecutorBridge.swift b/stdlib/public/Concurrency/ExecutorBridge.swift
index 155c970c0d099..d4b5e1d11c81d 100644
--- a/stdlib/public/Concurrency/ExecutorBridge.swift
+++ b/stdlib/public/Concurrency/ExecutorBridge.swift
@@ -91,7 +91,7 @@ internal func _jobGetExecutorPrivateData(
   _ job: Builtin.Job
 ) -> UnsafeMutableRawPointer
 
-#if !$Embedded
+#if os(WASI) || !$Embedded
 #if !SWIFT_STDLIB_TASK_TO_THREAD_MODEL_CONCURRENCY
 @available(StdlibDeploymentTarget 6.2, *)
 @_silgen_name("swift_getMainExecutor")
@@ -104,7 +104,7 @@ internal func _getMainExecutorAsSerialExecutor() -> (any SerialExecutor)? {
 @_silgen_name("swift_getMainExecutor")
 internal func _getMainExecutorAsSerialExecutor() -> (any SerialExecutor)?
 #endif // SWIFT_STDLIB_TASK_TO_THREAD_MODEL_CONCURRENCY
-#endif // !$Embedded
+#endif // os(WASI) || !$Embedded
 
 @available(StdlibDeploymentTarget 6.2, *)
 @_silgen_name("swift_dispatchMain")
diff --git a/stdlib/public/Concurrency/MainActor.swift b/stdlib/public/Concurrency/MainActor.swift
index e60a1c766b428..3f57abe877171 100644
--- a/stdlib/public/Concurrency/MainActor.swift
+++ b/stdlib/public/Concurrency/MainActor.swift
@@ -12,7 +12,7 @@
 
 import Swift
 
-#if !$Embedded
+#if os(WASI) || !$Embedded
 
 #if SWIFT_STDLIB_TASK_TO_THREAD_MODEL_CONCURRENCY
 @available(SwiftStdlib 5.1, *)
@@ -197,4 +197,4 @@ public func _deinitOnExecutorMainActorBackDeploy(
 
 #endif // !SWIFT_STDLIB_TASK_TO_THREAD_MODEL_CONCURRENCY
 
-#endif // !$Embedded
+#endif // os(WASI) || !$Embedded