diff --git a/dlls/ntdll/nt.c b/dlls/ntdll/nt.c
index 9ad2aca0eb6..503aa092cd1 100644
--- a/dlls/ntdll/nt.c
+++ b/dlls/ntdll/nt.c
@@ -859,14 +859,36 @@ NTSTATUS WINAPI NtDisplayString ( PUNICODE_STRING string )
     return ret;
 }
 
+/******************************************************************************
+ *  NtInitiatePowerAction                       [NTDLL.@]
+ *
+ */
+NTSTATUS WINAPI NtInitiatePowerAction(
+	IN POWER_ACTION SystemAction,
+	IN SYSTEM_POWER_STATE MinSystemState,
+	IN ULONG Flags,
+	IN BOOLEAN Asynchronous)
+{
+        FIXME("(%d,%d,0x%08lx,%d),stub\n",
+		SystemAction,MinSystemState,Flags,Asynchronous);
+        return STATUS_NOT_IMPLEMENTED;
+}
+	
+
 /******************************************************************************
  *  NtPowerInformation				[NTDLL.@]
  *
  */
-NTSTATUS WINAPI NtPowerInformation(DWORD x1,DWORD x2,DWORD x3,DWORD x4,DWORD x5)
+NTSTATUS WINAPI NtPowerInformation(
+	IN POWER_INFORMATION_LEVEL InformationLevel,
+	IN PVOID lpInputBuffer,
+	IN ULONG nInputBufferSize,
+	IN PVOID lpOutputBuffer,
+	IN ULONG nOutputBufferSize)
 {
-	FIXME("(0x%08lx,0x%08lx,0x%08lx,0x%08lx,0x%08lx),stub\n",x1,x2,x3,x4,x5);
-	return 0;
+	FIXME("(%d,%p,%ld,%p,%ld),stub\n",
+		InformationLevel,lpInputBuffer,nInputBufferSize,lpOutputBuffer,nOutputBufferSize);
+	return STATUS_NOT_IMPLEMENTED;
 }
 
 /******************************************************************************
diff --git a/dlls/ntdll/ntdll.spec b/dlls/ntdll/ntdll.spec
index 60fa7920b0c..fbe7f6c275a 100644
--- a/dlls/ntdll/ntdll.spec
+++ b/dlls/ntdll/ntdll.spec
@@ -128,6 +128,7 @@
 @ stub NtImpersonateClientOfPort
 @ stub NtImpersonateThread
 @ stub NtInitializeRegistry
+@ stdcall NtInitiatePowerAction (long long long long)
 @ stdcall NtListenPort(ptr ptr)
 @ stdcall NtLoadDriver(ptr)
 @ stdcall NtLoadKey(ptr ptr)
@@ -154,6 +155,7 @@
 @ stdcall NtOpenThreadToken(long long long long)
 @ stdcall NtOpenTimer(ptr long ptr)
 @ stub NtPlugPlayControl
+@ stdcall NtPowerInformation(long ptr long ptr long)
 @ stub NtPrivilegeCheck
 @ stub NtPrivilegeObjectAuditAlarm
 @ stub NtPrivilegedServiceAuditAlarm
@@ -995,7 +997,6 @@
 @ stub RtlClosePropertySet
 @ stub RtlCreatePropertySet
 @ stub RtlSetPropertySetClassId
-@ stdcall NtPowerInformation(long long long long long)
 @ stdcall -ret64 VerSetConditionMask(long long long long)
 
 ##################
diff --git a/include/winternl.h b/include/winternl.h
index 6e22f8f9e76..44dba8a0f2c 100644
--- a/include/winternl.h
+++ b/include/winternl.h
@@ -1460,6 +1460,7 @@ NTSTATUS  WINAPI NtGetContextThread(HANDLE,CONTEXT*);
 NTSTATUS  WINAPI NtImpersonateAnonymousToken(HANDLE);
 NTSTATUS  WINAPI NtImpersonateClientOfPort(HANDLE,PPORT_MESSAGE);
 NTSTATUS  WINAPI NtImpersonateThread(HANDLE,HANDLE,PSECURITY_QUALITY_OF_SERVICE);
+NTSTATUS  WINAPI NtInitiatePowerAction(POWER_ACTION,SYSTEM_POWER_STATE,ULONG,BOOLEAN);
 NTSTATUS  WINAPI NtLoadDriver(const UNICODE_STRING *);
 NTSTATUS  WINAPI NtLoadKey(const OBJECT_ATTRIBUTES *,OBJECT_ATTRIBUTES *);
 NTSTATUS  WINAPI NtLockFile(HANDLE,HANDLE,PIO_APC_ROUTINE,void*,PIO_STATUS_BLOCK,PLARGE_INTEGER,PLARGE_INTEGER,ULONG*,BOOLEAN,BOOLEAN);
@@ -1477,6 +1478,7 @@ NTSTATUS  WINAPI NtOpenSemaphore(PHANDLE,ACCESS_MASK,const OBJECT_ATTRIBUTES*);
 NTSTATUS  WINAPI NtOpenThread(HANDLE*,ACCESS_MASK,const OBJECT_ATTRIBUTES*,const CLIENT_ID*);
 NTSTATUS  WINAPI NtOpenThreadToken(HANDLE,DWORD,BOOLEAN,HANDLE *);
 NTSTATUS  WINAPI NtOpenTimer(HANDLE*, ACCESS_MASK, const OBJECT_ATTRIBUTES*);
+NTSTATUS  WINAPI NtPowerInformation(POWER_INFORMATION_LEVEL,PVOID,ULONG,PVOID,ULONG);
 NTSTATUS  WINAPI NtProtectVirtualMemory(HANDLE,PVOID*,ULONG*,ULONG,ULONG*);
 NTSTATUS  WINAPI NtPulseEvent(HANDLE,PULONG);
 NTSTATUS  WINAPI NtQueueApcThread(HANDLE,PNTAPCFUNC,ULONG_PTR,ULONG_PTR,ULONG_PTR);