diff --git a/libretro/Makefile b/libretro/Makefile
index 88f87c3..8fe1a42 100644
--- a/libretro/Makefile
+++ b/libretro/Makefile
@@ -138,7 +138,7 @@ all: $(TARGET)
 $(CORE_DIR)/libretro/%_boot.c: $(CORE_DIR)/build/bin/BootROMs/%_boot.bin
 	echo "/* AUTO-GENERATED */" > $@
 	echo "const unsigned char $(notdir $(@:%.c=%))[] = {" >> $@
-	cat $< | xxd -i >> $@
+	hexdump -v -e '/1 "0x%02x, "' $< >> $@
 	echo "};" >> $@
 	echo "const unsigned $(notdir $(@:%.c=%))_length = sizeof($(notdir $(@:%.c=%)));" >> $@