diff --git a/dlls/Makedll.rules.in b/dlls/Makedll.rules.in
index b8a83ed4796ad6ed7e2251ee9a95c81a0c5eda7b..7fb7f7dd90c07d789a1690720dd45639631a2272 100644
--- a/dlls/Makedll.rules.in
+++ b/dlls/Makedll.rules.in
@@ -9,7 +9,7 @@
 # plus all variables required by the global Make.rules.in
 #
 
-DEFS       = @DLLFLAGS@ -D__WINE__
+DEFS       = @DLLFLAGS@ -D__WINE__ $(EXTRADEFS)
 LIBEXT     = @LIBEXT@
 SONAME     = lib$(MODULE).so
 IMPORTLIBS = $(IMPORTS:%=$(DLLDIR)/lib%.$(LIBEXT))