diff --git a/dlls/msvcp90/locale.c b/dlls/msvcp90/locale.c
index 5cba182b6c6..7b98539c9d3 100644
--- a/dlls/msvcp90/locale.c
+++ b/dlls/msvcp90/locale.c
@@ -222,6 +222,16 @@ void __cdecl locale_facet_register(locale_facet *add)
     list_add_head(&lazy_facets, &head->entry);
 }
 
+/* Not exported from msvcp90 */
+/* ?_Register@facet@locale@std@@QAEXXZ */
+/* ?_Register@facet@locale@std@@QEAAXXZ */
+DEFINE_THISCALL_WRAPPER(locale_facet__Register, 4)
+void __thiscall locale_facet__Register(locale_facet *this)
+{
+    TRACE("(%p)\n", this);
+    locale_facet_register(this);
+}
+
 /* Not exported from msvcp90 */
 /* ??_7facet@locale@std@@6B@ */
 extern const vtable_ptr MSVCP_locale_facet_vtable;
diff --git a/dlls/msvcp90/msvcp90.spec b/dlls/msvcp90/msvcp90.spec
index 6d2656ce148..7126603094c 100644
--- a/dlls/msvcp90/msvcp90.spec
+++ b/dlls/msvcp90/msvcp90.spec
@@ -5817,3 +5817,5 @@
 @ extern ??_7facet@locale@std@@6B@ MSVCP_locale_facet_vtable
 @ cdecl -arch=win32 ?facet_Register@facet@locale@std@@CAXPAV123@@Z(ptr) locale_facet_register
 @ cdecl -arch=win64 ?facet_Register@facet@locale@std@@CAXPEAV123@@Z(ptr) locale_facet_register
+@ thiscall -arch=win32 ?_Register@facet@locale@std@@QAEXXZ(ptr) locale_facet__Register
+@ cdecl -arch=win64 ?_Register@facet@locale@std@@QEAAXXZ(ptr) locale_facet__Register