diff --git a/stdlib/public/Synchronization/CMakeLists.txt b/stdlib/public/Synchronization/CMakeLists.txt
index 299213ac577b3..69754b9fb09be 100644
--- a/stdlib/public/Synchronization/CMakeLists.txt
+++ b/stdlib/public/Synchronization/CMakeLists.txt
@@ -192,13 +192,24 @@ if(SWIFT_SHOULD_BUILD_EMBEDDED_STDLIB)
     if(SWIFT_EMBEDDED_STDLIB_SDKS_FOR_TARGET_TRIPLES)
       set(SWIFT_SDK_embedded_ARCH_${arch}_PATH "${EMBEDDED_STDLIB_SDK_FOR_${triple}}")
     endif()
+
+    set(SWIFT_SYNCHRONIZATION_EMBEDDED_SOURCES)
+
+    if("${arch}" MATCHES "wasm32")
+      list(APPEND SWIFT_SYNCHRONIZATION_EMBEDDED_SOURCES ${SWIFT_SYNCHRONIZATION_SOURCES})
+      list(APPEND SWIFT_SYNCHRONIZATION_EMBEDDED_SOURCES ${SWIFT_SYNCHRONIZATION_WASM_SOURCES})
+    else()
+      list(APPEND SWIFT_SYNCHRONIZATION_EMBEDDED_SOURCES ${SWIFT_SYNCHRONIZATION_ATOMIC_SOURCES})
+    endif()
+      
     add_swift_target_library_single(
       embedded-synchronization-${mod}
       swiftSynchronization
       ONLY_SWIFTMODULE
       IS_FRAGILE
       
-      ${SWIFT_SYNCHRONIZATION_ATOMIC_SOURCES}
+      ${SWIFT_SYNCHRONIZATION_EMBEDDED_SOURCES}
+      
       GYB_SOURCES
         ${SWIFT_SYNCHRONIZATION_GYB_SOURCES}
 
diff --git a/test/embedded/wasm/mutex.swift b/test/embedded/wasm/mutex.swift
new file mode 100644
index 0000000000000..04199402ffe22
--- /dev/null
+++ b/test/embedded/wasm/mutex.swift
@@ -0,0 +1,21 @@
+// RUN: %target-run-simple-swift(-enable-experimental-feature Embedded -parse-as-library -wmo) | %FileCheck %s
+
+// REQUIRES: executable_test
+// REQUIRES: OS=wasip1
+// REQUIRES: swift_feature_Embedded
+
+import Synchronization
+@main struct Main {
+  static func main() {
+    let m = Mutex(42)
+
+    m.withLock {
+      print("Hello \($0)")  // CHECK: Hello 42
+      $0 = 37
+    }
+    
+    m.withLock {
+      print("Hello \($0)")  // CHECK: Hello 37
+    }
+  }
+}