diff --git a/Makefile b/Makefile
index 88a1d43..60dec8c 100644
--- a/Makefile
+++ b/Makefile
@@ -1,6 +1,7 @@
 PROGNAME = ocaml-glpk
 DISTFILES = CHANGES COPYING Makefile README VERSION \
             src/Makefile src/OCamlMakefile src/META src/*.ml src/*.mli src/*.c \
+            src/oldapi/* \
             examples/Makefile examples/OCamlMakefile examples/*.ml \
             doc/html
 VERSION := $(shell cat VERSION)