diff --git a/lib/.cppi-disable b/lib/.cppi-disable
index ce6d414d2..cfacdfc63 100644
--- a/lib/.cppi-disable
+++ b/lib/.cppi-disable
@@ -5,7 +5,6 @@ getopt.c
 getopt1.c
 md5.h
 obstack.h
-obstack.c
 regex.h
 regex.c
 getpagesize.h