diff --git a/Makefile.in b/Makefile.in
index e4d3738ae432d8724be1be44ae2991f53b61dad8..7ce8bb8866751af52b96c4a5d014b21778aa887a 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -292,9 +292,9 @@ des_headers = rotors.h keymap.h
 
 # Generate DES headers.
 $(des_headers): desdata.c
-	$(MAKE) desdata$(EXEEXT)
+	$(MAKE) desdata$(EXEEXT_FOR_BUILD)
 	f="$(srcdir)/`basename $@`"; \
-	  ./desdata$(EXEEXT) $(@F) > $${f}T; \
+	  ./desdata$(EXEEXT_FOR_BUILD) $(@F) > $${f}T; \
 	  test -s $${f}T && mv -f $${f}T $$f
 
 des.$(OBJEXT): des.c des.h $(des_headers)