diff --git a/dlls/tdi.sys/Makefile.in b/dlls/tdi.sys/Makefile.in
index d414ff7dfd9..9d5e05f4a6e 100644
--- a/dlls/tdi.sys/Makefile.in
+++ b/dlls/tdi.sys/Makefile.in
@@ -1,5 +1,7 @@
 MODULE    = tdi.sys
 EXTRADLLFLAGS = -Wl,--subsystem,native
 
+EXTRADLLFLAGS = -mno-cygwin
+
 C_SRCS = \
 	main.c