diff --git a/dlls/ksecdd.sys/Makefile.in b/dlls/ksecdd.sys/Makefile.in
index 9b6430e0e8c..ae537b25a00 100644
--- a/dlls/ksecdd.sys/Makefile.in
+++ b/dlls/ksecdd.sys/Makefile.in
@@ -1,6 +1,8 @@
 MODULE    = ksecdd.sys
 EXTRADLLFLAGS = -Wl,--subsystem,native
 
+EXTRADLLFLAGS = -mno-cygwin
+
 C_SRCS = \
 	main.c