diff --git a/scripts/Makefile.spl b/scripts/Makefile.spl
index ea67137..fd572f4 100644
--- a/scripts/Makefile.spl
+++ b/scripts/Makefile.spl
@@ -167,7 +167,7 @@
 
 quiet_cmd_cpp_cfg = CFG     $@
 cmd_cpp_cfg = $(CPP) -Wp,-MD,$(depfile) $(cpp_flags) $(LDPPFLAGS) -ansi \
-		-D__ASSEMBLY__ -x assembler-with-cpp -P -dM -E -o $@ $<
+	-DDO_DEPS_ONLY -D__ASSEMBLY__ -x assembler-with-cpp -P -dM -E -o $@ $<
 
 $(obj)/$(SPL_BIN).cfg:	include/config.h
 	$(call if_changed,cpp_cfg)