diff --git a/dlls/dispex/Makefile.in b/dlls/dispex/Makefile.in
index f091bfd40db..aaa8c5eea2d 100644
--- a/dlls/dispex/Makefile.in
+++ b/dlls/dispex/Makefile.in
@@ -1,6 +1,6 @@
 MODULE    = dispex.dll
 IMPORTS   = uuid oleaut32 ole32 rpcrt4 advapi32
-EXTRADEFS = -DREGISTER_PROXY_DLL -DPROXY_DELEGATION
+EXTRADEFS = -DWINE_REGISTER_DLL -DPROXY_DELEGATION
 
 EXTRA_OBJS = dlldata.o
 
@@ -10,4 +10,7 @@ C_SRCS = \
 IDL_P_SRCS = \
 	disp_ex.idl
 
+IDL_R_SRCS = \
+	disp_ex.idl
+
 @MAKE_DLL_RULES@