diff --git a/makefile b/makefile
index 3dcc1e2aa8d..e18a5817a02 100644
--- a/makefile
+++ b/makefile
@@ -1485,7 +1485,7 @@ $(GENDIR)/%.lh: $(SRC)/%.lay scripts/build/complay.py | $(GEN_FOLDERS)
 
 $(GENDIR)/mame/drivers/ymmu100.hxx: $(SRC)/mame/drivers/ymmu100.ppm scripts/build/file2str.py
 	@echo Converting $<...
-	$(SILENT)$(PYTHON) scripts/build/file2str.py $< $@ ymmu100_bkg UINT8
+	$(SILENT)$(PYTHON) scripts/build/file2str.py $< $@ ymmu100_bkg uint8_t
 
 $(SRC)/devices/cpu/m68000/m68kops.cpp: $(SRC)/devices/cpu/m68000/m68k_in.cpp $(SRC)/devices/cpu/m68000/m68kmake.cpp
 ifeq ($(TARGETOS),asmjs)