diff --git a/lib/Makefile.am b/lib/Makefile.am
index 62a915036..3aff9e66e 100644
--- a/lib/Makefile.am
+++ b/lib/Makefile.am
@@ -28,6 +28,7 @@ savedir.h strverscmp.h \
 version-etc.h xalloc.h xstrtol.h
 
 BUILT_SOURCES = getdate.c lstat.c stat.c
+MAINTAINERCLEANFILES = $(BUILT_SOURCES)
 
 EXTRA_DIST = xstat.in
 lstat.c: xstat.in