diff --git a/lib/Makefile.am b/lib/Makefile.am
index c70d4760..2a24d0d0 100644
--- a/lib/Makefile.am
+++ b/lib/Makefile.am
@@ -35,6 +35,7 @@ EXTRA_DIST = malloc.c realloc.c strnlen.c
 libbison_a_SOURCES = \
   gettext.h \
   basename.c dirname.h dirname.c \
+  get-errno.h get-errno.c \
   getopt.h getopt.c getopt1.c \
   hash.h hash.c \
   mbswidth.h mbswidth.c \