diff --git a/dlls/ntdll/ntdll.spec b/dlls/ntdll/ntdll.spec
index 6e996a58d33..b63e335e25f 100644
--- a/dlls/ntdll/ntdll.spec
+++ b/dlls/ntdll/ntdll.spec
@@ -152,6 +152,7 @@
 @ stdcall NtCreateSemaphore(ptr long ptr long long)
 @ stdcall NtCreateSymbolicLinkObject(ptr long ptr ptr)
 @ stub NtCreateThread
+@ stdcall NtCreateThreadEx(ptr long ptr long ptr ptr long long long long ptr)
 @ stdcall NtCreateTimer(ptr long ptr long)
 @ stub NtCreateToken
 # @ stub NtCreateWaitablePort
diff --git a/dlls/ntdll/thread.c b/dlls/ntdll/thread.c
index 9ec94d67801..35e23d21ed5 100644
--- a/dlls/ntdll/thread.c
+++ b/dlls/ntdll/thread.c
@@ -524,6 +524,23 @@ static void start_thread( struct startup_info *info )
 }
 
 
+/***********************************************************************
+ *              NtCreateThreadEx   (NTDLL.@)
+ */
+NTSTATUS WINAPI NtCreateThreadEx( HANDLE *handle_ptr, ACCESS_MASK access, OBJECT_ATTRIBUTES *attr,
+                                  HANDLE process, LPTHREAD_START_ROUTINE start, void *param,
+                                  ULONG flags, ULONG zero_bits, ULONG stack_commit,
+                                  ULONG stack_reserve, void *attribute_list )
+{
+    FIXME( "%p, %x, %p, %p, %p, %p, %x, %x, %x, %x, %p semi-stub!\n", handle_ptr, access, attr,
+           process, start, param, flags, zero_bits, stack_commit, stack_reserve, attribute_list );
+
+    return RtlCreateUserThread( process, NULL, flags & THREAD_CREATE_FLAGS_CREATE_SUSPENDED,
+                                NULL, stack_reserve, stack_commit, (PRTL_THREAD_START_ROUTINE)start,
+                                param, handle_ptr, NULL );
+}
+
+
 /***********************************************************************
  *              RtlCreateUserThread   (NTDLL.@)
  */
diff --git a/include/winternl.h b/include/winternl.h
index 67339772490..98bf20180ff 100644
--- a/include/winternl.h
+++ b/include/winternl.h
@@ -2200,6 +2200,13 @@ typedef struct _SYSTEM_MODULE_INFORMATION
     SYSTEM_MODULE       Modules[1]; /* FIXME: should be Modules[0] */
 } SYSTEM_MODULE_INFORMATION, *PSYSTEM_MODULE_INFORMATION;
 
+#define THREAD_CREATE_FLAGS_CREATE_SUSPENDED        0x00000001
+#define THREAD_CREATE_FLAGS_SKIP_THREAD_ATTACH      0x00000002
+#define THREAD_CREATE_FLAGS_HIDE_FROM_DEBUGGER      0x00000004
+#define THREAD_CREATE_FLAGS_HAS_SECURITY_DESCRIPTOR 0x00000010
+#define THREAD_CREATE_FLAGS_ACCESS_CHECK_IN_TARGET  0x00000020
+#define THREAD_CREATE_FLAGS_INITIAL_THREAD          0x00000080
+
 /***********************************************************************
  * Function declarations
  */