diff --git a/Meta/Lagom/CMakeLists.txt b/Meta/Lagom/CMakeLists.txt
index 47cbea7eb5..b64b1d91af 100644
--- a/Meta/Lagom/CMakeLists.txt
+++ b/Meta/Lagom/CMakeLists.txt
@@ -108,6 +108,8 @@ include_directories(../../Userland/)
 include_directories(../../Userland/Libraries/)
 include_directories(${CMAKE_BINARY_DIR})
 add_library(LagomCore ${LAGOM_CORE_SOURCES})
+find_package(Threads REQUIRED)
+target_link_libraries(LagomCore PRIVATE Threads::Threads)
 
 if (BUILD_LAGOM)
     add_library(Lagom $<TARGET_OBJECTS:LagomCore> ${LAGOM_MORE_SOURCES})
diff --git a/Userland/Libraries/LibThreading/Lock.h b/Userland/Libraries/LibThreading/Lock.h
index a0613c1800..57ed4cae8e 100644
--- a/Userland/Libraries/LibThreading/Lock.h
+++ b/Userland/Libraries/LibThreading/Lock.h
@@ -14,14 +14,25 @@ namespace Threading {
 
 class Lock {
 public:
-    Lock() { }
+    Lock() {
+#ifndef __serenity__
+    pthread_mutexattr_t attr;
+    pthread_mutexattr_init(&attr);
+    pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
+    pthread_mutex_init(&m_mutex, &attr);
+#endif
+    }
     ~Lock() { }
 
     void lock();
     void unlock();
 
 private:
+#ifdef __serenity__
     pthread_mutex_t m_mutex = PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP;
+#else
+    pthread_mutex_t m_mutex;
+#endif
 };
 
 class Locker {