diff --git a/Makefile.am b/Makefile.am
index 514d0e2c3a..ad0f202b90 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -651,7 +651,7 @@ EXTRA_DIST += \
 	units/initrd-switch-root.service.in \
 	units/systemd-nspawn@.service.in \
 	units/systemd-update-done.service.in \
-    units/tmp.mount.m4
+	units/tmp.mount.m4
 
 if HAVE_SYSV_COMPAT
 nodist_systemunit_DATA += \