Minor
diff --git a/src/Makefile.am b/src/Makefile.am
index b62e7d0..912a98c 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -1,5 +1,6 @@
# Process this file with automake to produce Makefile.in
+NULL =
SUBDIRS =
DIST_SUBDIRS =
BUILT_SOURCES =
diff --git a/src/Makefile.sources b/src/Makefile.sources
index 4349e0a..213aa22 100644
--- a/src/Makefile.sources
+++ b/src/Makefile.sources
@@ -1,5 +1,3 @@
-NULL =
-
# Base and default-included sources and headers
HB_BASE_sources = \
diff --git a/test/shaping/data/text-rendering-tests/update.sh b/test/shaping/data/text-rendering-tests/update.sh
index 31960a1..47545bc 100755
--- a/test/shaping/data/text-rendering-tests/update.sh
+++ b/test/shaping/data/text-rendering-tests/update.sh
@@ -21,8 +21,6 @@
test -d tests && (echo "tests/ dir not empty; investigate."; false)
mkdir tests
-echo "NULL =" > Makefile.sources
-echo > Makefile.sources
echo "TESTS = \\" > Makefile.sources
DISABLED="DISBALED_TESTS = \\"
diff --git a/util/Makefile.am b/util/Makefile.am
index 2543a60..e6620a2 100644
--- a/util/Makefile.am
+++ b/util/Makefile.am
@@ -1,5 +1,6 @@
# Process this file with automake to produce Makefile.in
+NULL =
EXTRA_DIST =
CLEANFILES =
DISTCLEANFILES =
diff --git a/util/Makefile.sources b/util/Makefile.sources
index 368fdb0..d6c00cc 100644
--- a/util/Makefile.sources
+++ b/util/Makefile.sources
@@ -1,5 +1,3 @@
-NULL =
-
HB_VIEW_sources = \
hb-view.cc \
options.cc \
