diff --git a/dll/win32/lsasrv/service.c b/dll/win32/lsasrv/service.c
index 95fe262c7b2..73c222935d3 100644
--- a/dll/win32/lsasrv/service.c
+++ b/dll/win32/lsasrv/service.c
@@ -10,11 +10,10 @@
 
 #include "lsasrv.h"
 #include <winsvc.h>
+#include <winsvc_undoc.h>
 
 typedef VOID (WINAPI *PNETLOGONMAIN)(INT ArgCount, PWSTR *ArgVector);
 
-VOID WINAPI I_ScIsSecurityProcess(VOID);
-
 static VOID WINAPI NetlogonServiceMain(DWORD dwArgc, PWSTR *pszArgv);
 static VOID WINAPI SamSsServiceMain(DWORD dwArgc, PWSTR *pszArgv);
 
diff --git a/dll/win32/setupapi/cfgmgr.c b/dll/win32/setupapi/cfgmgr.c
index f0b49db3fe9..e7bad283923 100644
--- a/dll/win32/setupapi/cfgmgr.c
+++ b/dll/win32/setupapi/cfgmgr.c
@@ -24,18 +24,12 @@
 #include <dbt.h>
 #include <pnp_c.h>
 #include <winsvc.h>
+#include <winsvc_undoc.h>
 
 #include <pseh/pseh2.h>
 
 #include "rpc_private.h"
 
-DWORD
-WINAPI
-I_ScPnPGetServiceName(IN SERVICE_STATUS_HANDLE hServiceStatus,
-                      OUT LPWSTR lpServiceName,
-                      IN DWORD cchServiceName);
-
-
 /* Registry key and value names */
 static const WCHAR BackslashOpenBrace[] = {'\\', '{', 0};
 static const WCHAR CloseBrace[] = {'}', 0};
diff --git a/sdk/include/reactos/winsvc_undoc.h b/sdk/include/reactos/winsvc_undoc.h
new file mode 100644
index 00000000000..d10ea767141
--- /dev/null
+++ b/sdk/include/reactos/winsvc_undoc.h
@@ -0,0 +1,102 @@
+#ifndef _WINSVC_UNDOC_H_
+#define _WINSVC_UNDOC_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#if !defined(__midl) && !defined(__WIDL__)
+typedef enum _TAG_INFO_LEVEL
+{
+    TagInfoLevelNameFromTag = 1,
+} TAG_INFO_LEVEL;
+
+typedef enum _TAG_TYPE
+{
+    TagTypeService = 1,
+} TAG_TYPE;
+
+typedef struct _TAG_INFO_NAME_FROM_TAG_IN_PARAMS
+{
+    DWORD dwPid;
+    DWORD dwTag;
+} TAG_INFO_NAME_FROM_TAG_IN_PARAMS, *PTAG_INFO_NAME_FROM_TAG_IN_PARAMS;
+
+typedef struct _TAG_INFO_NAME_FROM_TAG_OUT_PARAMS
+{
+    TAG_TYPE TagType;
+    LPWSTR pszName;
+} TAG_INFO_NAME_FROM_TAG_OUT_PARAMS, *PTAG_INFO_NAME_FROM_TAG_OUT_PARAMS;
+
+typedef struct _TAG_INFO_NAME_FROM_TAG
+{
+    TAG_INFO_NAME_FROM_TAG_IN_PARAMS InParams;
+    TAG_INFO_NAME_FROM_TAG_OUT_PARAMS OutParams;
+} TAG_INFO_NAME_FROM_TAG, *PTAG_INFO_NAME_FROM_TAG;
+#endif
+
+DWORD
+WINAPI
+I_QueryTagInformation(
+    PVOID Unused,
+    TAG_INFO_LEVEL dwInfoLevel,
+    PTAG_INFO_NAME_FROM_TAG InOutParams);
+
+DWORD
+WINAPI
+I_ScGetCurrentGroupStateW(
+    _In_ SC_HANDLE hSCManager,
+    _In_ LPWSTR pszGroupName,
+    _Out_ LPDWORD pdwGroupState);
+
+VOID
+WINAPI
+I_ScIsSecurityProcess(VOID);
+
+DWORD
+WINAPI
+I_ScPnPGetServiceName(
+    _In_ SERVICE_STATUS_HANDLE hServiceStatus,
+    _Out_ LPWSTR lpServiceName,
+    _In_ DWORD cchServiceName);
+
+/* I_ScSendPnPMessage */
+
+/* I_ScSendTSMessage */
+
+BOOL
+WINAPI
+I_ScSetServiceBitsA(
+    _In_ SERVICE_STATUS_HANDLE hServiceStatus,
+    _In_ DWORD dwServiceBits,
+    _In_ BOOL bSetBitsOn,
+    _In_ BOOL bUpdateImmediately,
+    _In_ LPSTR lpString);
+
+BOOL
+WINAPI
+I_ScSetServiceBitsW(
+    _In_ SERVICE_STATUS_HANDLE hServiceStatus,
+    _In_ DWORD dwServiceBits,
+    _In_ BOOL bSetBitsOn,
+    _In_ BOOL bUpdateImmediately,
+    _In_ LPWSTR lpString);
+
+#ifdef UNICODE
+#define I_ScSetServiceBits I_ScSetServiceBitsW
+#else /* UNICODE */
+#define I_ScSetServiceBits I_ScSetServiceBitsA
+#endif
+
+DWORD
+WINAPI
+I_ScValidatePnpService(
+    _In_ LPCWSTR pszMachineName,
+    _In_ LPCWSTR pszServiceName,
+    _Out_ SERVICE_STATUS_HANDLE *phServiceStatus);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _WINSVC_UNDOC_H_ */