diff --git a/tools/null_state_gen/Makefile.am b/tools/null_state_gen/Makefile.am
index 62b8ff70..58fbd538 100644
--- a/tools/null_state_gen/Makefile.am
+++ b/tools/null_state_gen/Makefile.am
@@ -1,7 +1,10 @@
+AM_CPPFLAGS = -I$(top_srcdir)
+
 noinst_PROGRAMS = intel_null_state_gen
 
 intel_null_state_gen_SOURCES = 	\
 	intel_batchbuffer.c \
+	intel_batchbuffer.h \
 	intel_renderstate_gen6.c \
 	intel_renderstate_gen7.c \
 	intel_renderstate_gen8.c \