diff --git a/Makefile b/Makefile
index aa680269e8..96c21c46db 100644
--- a/Makefile
+++ b/Makefile
@@ -2642,6 +2642,21 @@ dist: git-archive$(X) configure
 		$(GIT_TARNAME)/configure \
 		$(GIT_TARNAME)/version \
 		$(GIT_TARNAME)/git-gui/version
+ifdef DC_SHA1_SUBMODULE
+	@mkdir -p $(GIT_TARNAME)/sha1collisiondetection/lib
+	@cp sha1collisiondetection/LICENSE.txt \
+		$(GIT_TARNAME)/sha1collisiondetection/
+	@cp sha1collisiondetection/LICENSE.txt \
+		$(GIT_TARNAME)/sha1collisiondetection/
+	@cp sha1collisiondetection/lib/sha1.[ch] \
+		$(GIT_TARNAME)/sha1collisiondetection/lib/
+	@cp sha1collisiondetection/lib/ubc_check.[ch] \
+		$(GIT_TARNAME)/sha1collisiondetection/lib/
+	$(TAR) rf $(GIT_TARNAME).tar \
+		$(GIT_TARNAME)/sha1collisiondetection/LICENSE.txt \
+		$(GIT_TARNAME)/sha1collisiondetection/lib/sha1.[ch] \
+		$(GIT_TARNAME)/sha1collisiondetection/lib/ubc_check.[ch]
+endif
 	@$(RM) -r $(GIT_TARNAME)
 	gzip -f -9 $(GIT_TARNAME).tar