1 files changed, 1 insertions, 1 deletions
diff --git a/Makefile b/Makefile
index a2059db74..e33d1a469 100644
--- a/Makefile
+++ b/Makefile
@@ -149,7 +149,7 @@ $(DATA_ASM_BUILDDIR)/%.o: data_dep = $(shell $(SCANINC) $(DATA_ASM_SUBDIR)/$*.s)
 endif
 
 $(DATA_ASM_BUILDDIR)/%.o: $(DATA_ASM_SUBDIR)/%.s $$(data_dep)
-	$(PREPROC) $< charmap.txt | $(CPP) -I include | $(AS) $(ASFLAGS) -o $@
+	$(PREPROC) $< charmap.txt | $(CPP) -I include - | $(AS) $(ASFLAGS) -o $@
 
 $(SONG_BUILDDIR)/%.o: $(SONG_SUBDIR)/%.s
 	$(AS) $(ASFLAGS) -I sound -o $@ $<