--- a/lib/Makefile.am
+++ b/lib/Makefile.am
@@ -11,7 +11,7 @@
 
 libfu_a_SOURCES = getdate.y posixtm.y getopt.c getopt1.c \
 addext.c argmatch.c backupfile.c basename.c dirname.c filemode.c \
-full-write.c idcache.c \
+full-write.c human.c idcache.c \
 isdir.c long-options.c makepath.c modechange.c hash.c path-concat.c \
 safe-read.c save-cwd.c savedir.c stripslash.c userspec.c xgetcwd.c \
 xmalloc.c xstrdup.c xstrtol.c xstrtoul.c yesno.c
@@ -20,7 +20,7 @@
 libfu_a_DEPENDENCIES = $(libfu_a_LIBADD)
 
 noinst_HEADERS = argmatch.h backupfile.h error.h fnmatch.h fsusage.h \
-getdate.h getline.h getopt.h group-member.h long-options.h \
+getdate.h getline.h getopt.h group-member.h human.h long-options.h \
 makepath.h modechange.h mountlist.h hash.h path-concat.h pathmax.h \
 save-cwd.h savedir.h strverscmp.h xalloc.h xstrtol.h xstrtoul.h