diff --git a/Libraries/CMakeLists.txt b/Libraries/CMakeLists.txt
index c3db4a49f9d..372b966e708 100644
--- a/Libraries/CMakeLists.txt
+++ b/Libraries/CMakeLists.txt
@@ -9,6 +9,7 @@ add_subdirectory(LibRIFF)
 add_subdirectory(LibSyntax)
 add_subdirectory(LibTest)
 add_subdirectory(LibTextCodec)
+add_subdirectory(LibThreading)
 add_subdirectory(LibUnicode)
 add_subdirectory(LibURL)
 add_subdirectory(LibXML)
@@ -22,7 +23,6 @@ add_subdirectory(LibHTTP)
 add_subdirectory(LibIPC)
 add_subdirectory(LibLine)
 add_subdirectory(LibRequests)
-add_subdirectory(LibThreading)
 add_subdirectory(LibTLS)
 add_subdirectory(LibWasm)
 add_subdirectory(LibWebSocket)
diff --git a/Tests/CMakeLists.txt b/Tests/CMakeLists.txt
index b5a1fce6951..59decf12ea8 100644
--- a/Tests/CMakeLists.txt
+++ b/Tests/CMakeLists.txt
@@ -5,6 +5,7 @@ add_subdirectory(LibDiff)
 add_subdirectory(LibGC)
 add_subdirectory(LibJS)
 add_subdirectory(LibRegex)
+add_subdirectory(LibThreading)
 add_subdirectory(LibURL)
 
 # FIXME: Increase support for building targets on Windows
@@ -16,7 +17,6 @@ add_subdirectory(LibCore)
 add_subdirectory(LibDNS)
 add_subdirectory(LibTest)
 add_subdirectory(LibTextCodec)
-add_subdirectory(LibThreading)
 add_subdirectory(LibTLS)
 add_subdirectory(LibUnicode)
 add_subdirectory(LibWasm)
diff --git a/Tests/LibThreading/TestThread.cpp b/Tests/LibThreading/TestThread.cpp
index 38396056a38..2e2717f5c11 100644
--- a/Tests/LibThreading/TestThread.cpp
+++ b/Tests/LibThreading/TestThread.cpp
@@ -5,9 +5,9 @@
  */
 
 #include <AK/Time.h>
+#include <LibCore/System.h>
 #include <LibTest/TestCase.h>
 #include <LibThreading/Thread.h>
-#include <unistd.h>
 
 using namespace AK::TimeLiterals;
 
@@ -19,7 +19,7 @@ static void sleep_until_thread_exits(Threading::Thread const& thread)
         if (thread.has_exited())
             return;
 
-        usleep(delay.to_microseconds());
+        (void)Core::System::sleep_ms(delay.to_milliseconds());
     }
 
     FAIL("Timed out waiting for thread to exit");
@@ -30,7 +30,7 @@ TEST_CASE(threads_can_detach)
     IGNORE_USE_IN_ESCAPING_LAMBDA Atomic<int> should_be_42 = 0;
 
     auto thread = Threading::Thread::construct([&should_be_42]() {
-        usleep(10 * 1000);
+        (void)Core::System::sleep_ms(10);
         should_be_42 = 42;
         return 0;
     });
@@ -46,7 +46,7 @@ TEST_CASE(detached_threads_do_not_need_to_be_joined)
     IGNORE_USE_IN_ESCAPING_LAMBDA Atomic<bool> should_exit { false };
     auto thread = Threading::Thread::construct([&]() {
         while (!should_exit.load())
-            usleep(10 * 1000);
+            (void)Core::System::sleep_ms(10);
         return 0;
     });
     thread->start();