diff --git a/openbsc/tests/debug/Makefile.am b/openbsc/tests/debug/Makefile.am
index 86cd7b3..8423fd1 100644
--- a/openbsc/tests/debug/Makefile.am
+++ b/openbsc/tests/debug/Makefile.am
@@ -1,4 +1,5 @@
 INCLUDES = $(all_includes) -I$(top_srcdir)/include
+AM_CFLAGS=-Wall $(LIBOSMOCORE_CFLAGS)
 noinst_PROGRAMS = debug_test
 
 debug_test_SOURCES = debug_test.c $(top_srcdir)/src/debug.c