diff --git a/dlls/slc/slc.c b/dlls/slc/slc.c
index a0d8999f5a3..7b7a6c6f77f 100644
--- a/dlls/slc/slc.c
+++ b/dlls/slc/slc.c
@@ -62,6 +62,13 @@ HRESULT WINAPI SLGetWindowsInformationDWORD(LPCWSTR lpszValueName, LPDWORD pdwVa
     return status ? E_FAIL : S_OK;
 }
 
+HRESULT WINAPI SLOpen(HSLC *handle)
+{
+    FIXME("(%p) stub\n", handle );
+
+    return S_OK;
+}
+
 /***********************************************************************
  *             DllMain   (CLUSAPI.@)
  *
diff --git a/dlls/slc/slc.spec b/dlls/slc/slc.spec
index af5545c6732..e4289d3ae1c 100644
--- a/dlls/slc/slc.spec
+++ b/dlls/slc/slc.spec
@@ -30,7 +30,7 @@
 @ stub SLInstallLicense
 @ stub SLInstallProofOfPurchase
 @ stub SLInstallSAMLicense
-@ stub SLOpen
+@ stdcall SLOpen(ptr)
 @ stub SLReArmWindows
 @ stub SLRegisterEvent
 @ stub SLRegisterWindowsEvent
diff --git a/include/slpublic.h b/include/slpublic.h
index c8bb559d2f3..dc02f3ce084 100644
--- a/include/slpublic.h
+++ b/include/slpublic.h
@@ -29,6 +29,8 @@ extern "C" {
 #define SLCAPI DECLSPEC_IMPORT
 #endif
 
+typedef PVOID HSLC;
+
 typedef enum _tagSLDATATYPE
 {
     SL_DATA_NONE     = REG_NONE,
@@ -41,7 +43,7 @@ typedef enum _tagSLDATATYPE
 
 SLCAPI HRESULT WINAPI SLGetWindowsInformation(LPCWSTR, SLDATATYPE*, UINT*, LPBYTE*);
 SLCAPI HRESULT WINAPI SLGetWindowsInformationDWORD(LPCWSTR, LPDWORD);
-
+SLCAPI HRESULT WINAPI SLOpen(HSLC*);
 
 #ifdef __cplusplus
 }