diff --git a/src/Makefile.in b/src/Makefile.in
index 0cc6998343d..76f68dd4e31 100644
--- a/src/Makefile.in
+++ b/src/Makefile.in
@@ -1177,7 +1177,7 @@ bootstrap: bootstrap-emacs
    Lisp files from loadup.el in source form.  */
 
 bootstrap-temacs: 
-	LC_ALL=C $(MAKE) $(MFLAGS) temacs ALL_CFLAGS="$(ALL_CFLAGS) -DPURESIZE=5000000"
+	LC_ALL=C $(MAKE) $(MFLAGS) temacs ALL_CFLAGS="$(ALL_CFLAGS) -DPURESIZE=5000000 -I../src"
 
 /* Dump an Emacs executable named bootstrap-emacs containing the 
    files from loadup.el in source form.  */