diff --git a/common.mk b/common.mk
index b782298..f7e4701 100644
--- a/common.mk
+++ b/common.mk
@@ -38,10 +38,14 @@ LDFLAGS += -Wl,--end-group
 
 include $(THISDIR)thirdparty/nugget/common.mk
 
+define OBJCOPYME
+$(PREFIX)-objcopy -I binary --set-section-alignment .data=4 --rename-section .data=.rodata,alloc,load,readonly,data,contents -O $(FORMAT) -B mips $< $@
+endef
+
 # convert TIM file to bin
 %.o: %.tim
-	$(PREFIX)-objcopy -I binary --set-section-alignment .data=4 --rename-section .data=.rodata,alloc,load,readonly,data,contents -O $(FORMAT) -B mips $< $@
+	$(call OBJCOPYME)
 
 # convert VAG files to bin
 %.o: %.vag
-	$(PREFIX)-objcopy -I binary --set-section-alignment .data=4 --rename-section .data=.rodata,alloc,load,readonly,data,contents -O $(FORMAT) -B mips $< $@
+	$(call OBJCOPYME)