diff --git a/dlls/spoolss/router.c b/dlls/spoolss/router.c
index 6fc7b5963c0..479d23a6a7f 100644
--- a/dlls/spoolss/router.c
+++ b/dlls/spoolss/router.c
@@ -354,6 +354,46 @@ BOOL WINAPI AddMonitorW(LPWSTR pName, DWORD Level, LPBYTE pMonitors)
     return (res == ROUTER_SUCCESS);
 }
 
+/******************************************************************
+ * AddPrinterDriverExW (spoolss.@)
+ *
+ * Install a Printer Driver with the Option to upgrade / downgrade the Files
+ *
+ * PARAMS
+ *  pName           [I] Servername or NULL (local Computer)
+ *  level           [I] Level for the supplied DRIVER_INFO_*W struct
+ *  pDriverInfo     [I] PTR to DRIVER_INFO_*W struct with the Driver Parameter
+ *  dwFileCopyFlags [I] How to Copy / Upgrade / Downgrade the needed Files
+ *
+ * RESULTS
+ *  Success: TRUE
+ *  Failure: FALSE
+ *
+ */
+BOOL WINAPI AddPrinterDriverExW(LPWSTR pName, DWORD level, LPBYTE pDriverInfo, DWORD dwFileCopyFlags)
+{
+    backend_t * pb;
+    DWORD res = ROUTER_UNKNOWN;
+
+    TRACE("(%s, %d, %p, 0x%x)\n", debugstr_w(pName), level, pDriverInfo, dwFileCopyFlags);
+
+    if (!pDriverInfo) {
+        SetLastError(ERROR_INVALID_PARAMETER);
+        return FALSE;
+    }
+
+    pb = backend_first(pName);
+    if (pb && pb->fpAddPrinterDriverEx)
+        res = pb->fpAddPrinterDriverEx(pName, level, pDriverInfo, dwFileCopyFlags);
+    else
+    {
+        SetLastError(ERROR_PROC_NOT_FOUND);
+    }
+
+    TRACE("got %u with %u\n", res, GetLastError());
+    return (res == ROUTER_SUCCESS);
+}
+
 /******************************************************************
  * DeleteMonitorW (spoolss.@)
  *
diff --git a/dlls/spoolss/spoolss.spec b/dlls/spoolss/spoolss.spec
index ad1ea60809f..68188ba390d 100644
--- a/dlls/spoolss/spoolss.spec
+++ b/dlls/spoolss/spoolss.spec
@@ -8,7 +8,7 @@
 @ stub AddPrintProcessorW
 @ stub AddPrintProvidorW
 @ stub AddPrinterConnectionW
-@ stub AddPrinterDriverExW
+@ stdcall AddPrinterDriverExW(wstr long ptr long)
 @ stub AddPrinterDriverW
 @ stub AddPrinterExW
 @ stub AddPrinterW