diff --git a/Make.rules.in b/Make.rules.in
index 822b4510aaa..5c54adeae82 100644
--- a/Make.rules.in
+++ b/Make.rules.in
@@ -71,7 +71,7 @@ WMC          = $(TOOLSDIR)/tools/wmc/wmc
 WIDL         = $(TOOLSDIR)/tools/widl/widl
 RC           = $(WRC)
 RC16         = $(WRC)
-RCFLAGS      = --nostdinc $(INCLUDES) $(EXTRARCFLAGS)
+RCFLAGS      = --nostdinc $(INCLUDES) $(DEFS) $(EXTRARCFLAGS)
 RC16FLAGS    = -O res16 $(RCFLAGS)
 LDPATH       = @LDPATH@
 DLLDIR       = $(TOPOBJDIR)/dlls