diff --git a/openbsc/tests/mm_auth/Makefile.am b/openbsc/tests/mm_auth/Makefile.am
index 516df00..7eb14fa 100644
--- a/openbsc/tests/mm_auth/Makefile.am
+++ b/openbsc/tests/mm_auth/Makefile.am
@@ -1,21 +1,36 @@
-AM_CPPFLAGS = $(all_includes) -I$(top_srcdir)/include
-AM_CFLAGS=-Wall \
-	  $(LIBOSMOCORE_CFLAGS) \
-	  $(LIBOSMOGSM_CFLAGS) \
-	  $(LIBCRYPTO_CFLAGS)
+AM_CPPFLAGS = \
+	$(all_includes) \
+	-I$(top_srcdir)/include \
+	$(NULL)
 
-noinst_PROGRAMS = mm_auth_test
+AM_CFLAGS = \
+	-Wall \
+	$(LIBOSMOCORE_CFLAGS) \
+	$(LIBOSMOGSM_CFLAGS) \
+	$(LIBCRYPTO_CFLAGS) \
+	$(NULL)
 
-EXTRA_DIST = mm_auth_test.ok
+noinst_PROGRAMS = \
+	mm_auth_test \
+	$(NULL)
 
-mm_auth_test_SOURCES = mm_auth_test.c
+EXTRA_DIST = \
+	mm_auth_test.ok \
+	$(NULL)
+
+mm_auth_test_SOURCES = \
+	mm_auth_test.c \
+	$(NULL)
 
 mm_auth_test_LDFLAGS = \
 	-Wl,--wrap=db_get_authinfo_for_subscr \
 	-Wl,--wrap=db_get_lastauthtuple_for_subscr \
-	-Wl,--wrap=db_sync_lastauthtuple_for_subscr
+	-Wl,--wrap=db_sync_lastauthtuple_for_subscr \
+	$(NULL)
 
-mm_auth_test_LDADD = $(top_builddir)/src/libmsc/libmsc.a \
-		     $(top_builddir)/src/libcommon/libcommon.a \
-		     $(LIBOSMOCORE_LIBS) \
-		     $(LIBOSMOGSM_LIBS)
+mm_auth_test_LDADD = \
+	$(top_builddir)/src/libmsc/libmsc.a \
+	$(top_builddir)/src/libcommon/libcommon.a \
+	$(LIBOSMOCORE_LIBS) \
+	$(LIBOSMOGSM_LIBS) \
+	$(NULL)