diff --git a/reactos/tools/rbuild/project.dtd b/reactos/tools/rbuild/project.dtd
index a84dc9f357b..87b37ef4d5b 100644
--- a/reactos/tools/rbuild/project.dtd
+++ b/reactos/tools/rbuild/project.dtd
@@ -114,7 +114,7 @@
 	if	%Text; #IMPLIED
 	ifnot	%Text; #IMPLIED
 	name	%CIdentifier; #IMPLIED
-	type	(buildtool|staticlibrary|objectlibrary|embeddedtypelib|kernel|kernelmodedll|kernelmodedriver|nativedll|nativecui|win32dll|win32ocx|win32cui|win32gui|win32scr|bootloader|bootsector|elfexecutable|idlheader|iso|isoregtest|liveiso|liveisoregtest|test|rpcserver|rpcclient|alias) #REQUIRED
+	type	(buildtool|staticlibrary|objectlibrary|embeddedtypelib|kernel|kernelmodedll|kernelmodedriver|nativedll|nativecui|win32dll|win32ocx|win32cui|win32gui|win32scr|bootloader|bootsector|elfexecutable|idlheader|iso|isoregtest|liveiso|liveisoregtest|test|rpcserver|rpcclient|rpcproxy|alias) #REQUIRED
 	extension	%CIdentifier; #IMPLIED
 	entrypoint	%CIdentifier; #IMPLIED
 	baseaddress	%CIdentifier; #IMPLIED