diff --git a/Makefile.arm11 b/Makefile.arm11
index ff73220..3539c65 100644
--- a/Makefile.arm11
+++ b/Makefile.arm11
@@ -116,7 +116,7 @@
 # main targets
 #---------------------------------------------------------------------------------
 $(OUTPUT).bin	:	$(OUTPUT).elf
-	@$(OBJCOPY) -O binary $< $@
+	@$(OBJCOPY) --gap-fill 0xFF -O binary $< $@
 	@echo built ... $(notdir $@)
 
 $(OUTPUT).elf	:	$(OFILES)
diff --git a/Makefile.arm9 b/Makefile.arm9
index 7a6a653..e4d9096 100644
--- a/Makefile.arm9
+++ b/Makefile.arm9
@@ -116,7 +116,7 @@
 # main targets
 #---------------------------------------------------------------------------------
 $(OUTPUT).bin	:	$(OUTPUT).elf
-	@$(OBJCOPY) -O binary $< $@
+	@$(OBJCOPY) --gap-fill 0xFF -O binary $< $@
 	@echo built ... $(notdir $@)
 
 $(OUTPUT).elf	:	$(OFILES)