diff --git a/reactos/tools/wpp/wpp_ros.diff b/reactos/tools/wpp/wpp_ros.diff
new file mode 100644
index 00000000000..34ea9288bed
--- /dev/null
+++ b/reactos/tools/wpp/wpp_ros.diff
@@ -0,0 +1,20 @@
+Index: preproc.c
+===================================================================
+--- preproc.c	(revision 28293)
++++ preproc.c	(revision 28294)
+@@ -328,6 +328,15 @@
+ 	char *tok;
+ 	char *cpy = pp_xstrdup(path);
+ 
++	/* check for absolute windows paths */
++	if (strchr(cpy, ':') != NULL)
++	{
++		nincludepath++;
++		includepath = pp_xrealloc(includepath, nincludepath * sizeof(*includepath));
++		includepath[nincludepath-1] = cpy;
++		return;
++	}
++
+ 	tok = strtok(cpy, INCLUDESEPARATOR);
+ 	while(tok)
+ 	{