diff --git a/Makefile b/Makefile
index ceee960c..c4dd1e12 100644
--- a/Makefile
+++ b/Makefile
@@ -41,7 +41,7 @@ SUBDIRS = inst/pre \
 		inst/post
 
 include $(TOPDIR)/make/proj.mk
-include $(TOPDIR)/make/topdir-autoconf.mk
+include $(MODDIR)/make/topdir-autoconf.mk
 
 define symversion
 nm $(LIB_A) | sed '/^[0-9]\{8\} T / !d; s/^[0-9]\{8\} T //' | sort -u