diff --git a/openbsc/tests/gsm0408/Makefile.am b/openbsc/tests/gsm0408/Makefile.am
index 44ca96c..f98c673 100644
--- a/openbsc/tests/gsm0408/Makefile.am
+++ b/openbsc/tests/gsm0408/Makefile.am
@@ -1,4 +1,5 @@
 INCLUDES = $(all_includes) -I$(top_srcdir)/include
+AM_CFLAGS=-Wall $(LIBOSMOCORE_CFLAGS)
 noinst_PROGRAMS = gsm0408_test
 
 gsm0408_test_SOURCES = gsm0408_test.c