diff --git a/dlls/inetcpl.cpl/inetcpl.c b/dlls/inetcpl.cpl/inetcpl.c
index 6981277b6fd..e11bf854d09 100644
--- a/dlls/inetcpl.cpl/inetcpl.c
+++ b/dlls/inetcpl.cpl/inetcpl.c
@@ -60,6 +60,15 @@ BOOL WINAPI DllMain(HINSTANCE hdll, DWORD reason, LPVOID reserved)
     return TRUE;
 }
 
+/***********************************************************************
+ *  DllInstall (inetcpl.@)
+ */
+HRESULT WINAPI DllInstall(BOOL bInstall, LPCWSTR cmdline)
+{
+    FIXME("(%s, %s): stub\n", bInstall ? "TRUE" : "FALSE", debugstr_w(cmdline));
+    return S_OK;
+}
+
 /******************************************************************************
  * propsheet_callback [internal]
  *
diff --git a/dlls/inetcpl.cpl/inetcpl.cpl.spec b/dlls/inetcpl.cpl/inetcpl.cpl.spec
index 90f1d4322f4..2e59562ce57 100644
--- a/dlls/inetcpl.cpl/inetcpl.cpl.spec
+++ b/dlls/inetcpl.cpl/inetcpl.cpl.spec
@@ -3,7 +3,7 @@
 @ stub AddInternetPropertySheetsEx
 @ stdcall CPlApplet(long long long long)
 @ stub DisplayPopupWindowManagementDialog
-@ stub DllInstall
+@ stdcall -private DllInstall(long wstr)
 @ stub GetAddSitesDisplayUrl
 @ stub ImportExportPFX
 @ stub LaunchAddSitesDialog