diff --git a/dlls/oleaut32/Makefile.in b/dlls/oleaut32/Makefile.in
index de61a256fc8..ca64fc90f0f 100644
--- a/dlls/oleaut32/Makefile.in
+++ b/dlls/oleaut32/Makefile.in
@@ -3,8 +3,7 @@ IMPORTLIB = oleaut32
 IMPORTS   = uuid ole32 rpcrt4 user32 gdi32 advapi32
 DELAYIMPORTS = comctl32 urlmon windowscodecs
 EXTRADEFS = -D_OLEAUT32_ -DCOM_NO_WINDOWS_H \
-    -DENTRY_PREFIX=OLEAUTPS_ -DPROXY_DELEGATION -DWINE_REGISTER_DLL \
-    -DPROXY_CLSID_IS="{0xb196b286,0xbab4,0x101a,{0xb6,0x9c,0x00,0xaa,0x00,0x34,0x1d,0x07}}"
+    -DENTRY_PREFIX=OLEAUTPS_ -DPROXY_DELEGATION -DWINE_REGISTER_DLL -DPROXY_CLSID=CLSID_PSFactoryBuffer
 
 C_SRCS = \
 	connpt.c \
diff --git a/dlls/oleaut32/oleaut.c b/dlls/oleaut32/oleaut.c
index 2a3257f3400..1fe6dcfbfb5 100644
--- a/dlls/oleaut32/oleaut.c
+++ b/dlls/oleaut32/oleaut.c
@@ -35,6 +35,7 @@
 #include "oleauto.h"
 #include "initguid.h"
 #include "typelib.h"
+#include "oleaut32_oaidl.h"
 
 #include "wine/debug.h"
 #include "wine/unicode.h"
diff --git a/dlls/oleaut32/oleaut32_oaidl.idl b/dlls/oleaut32/oleaut32_oaidl.idl
index 320e7ecfdc2..3574d081ab2 100644
--- a/dlls/oleaut32/oleaut32_oaidl.idl
+++ b/dlls/oleaut32/oleaut32_oaidl.idl
@@ -23,3 +23,9 @@
 cpp_quote("#if 0    /* oleaut32_oaidl.idl hack */")
 #include "oaidl.idl"
 cpp_quote("#endif   /* oleaut32_oaidl.idl hack */")
+
+[
+    threading(both),
+    uuid(b196b286-bab4-101a-b69c-00aa00341d07)
+]
+coclass PSFactoryBuffer { interface IFactoryBuffer; }
diff --git a/dlls/oleaut32/oleaut32_ocidl.idl b/dlls/oleaut32/oleaut32_ocidl.idl
index 9f6b7cfdfa1..514e5d945c9 100644
--- a/dlls/oleaut32/oleaut32_ocidl.idl
+++ b/dlls/oleaut32/oleaut32_ocidl.idl
@@ -18,6 +18,12 @@
 
 #include "ocidl.idl"
 
+[
+    threading(both),
+    uuid(b196b286-bab4-101a-b69c-00aa00341d07)
+]
+coclass PSFactoryBuffer { interface IFactoryBuffer; }
+
 [
     helpstring("Standard Font"),
     progid("StdFont"),