diff --git a/build32/Makefile b/build32/Makefile
index 08f269d..107ba80 100644
--- a/build32/Makefile
+++ b/build32/Makefile
@@ -1,5 +1,6 @@
 AS = as -32
 CC = gcc
+OBJCOPY = objcopy
 
 GIT = git
 
@@ -142,7 +143,7 @@ memtest_shared: $(OBJS) ldscripts/memtest_shared.lds Makefile
 	$(LD) -shared -Bsymbolic -T ldscripts/memtest_shared.lds -o $@ $(OBJS)
 
 memtest_shared.bin: memtest_shared
-	objcopy -O binary $< memtest_shared.bin
+	$(OBJCOPY) -O binary $< memtest_shared.bin
 
 memtest.bin: memtest_shared.bin boot/bootsect.o boot/setup.o ldscripts/memtest_bin.lds
 	$(eval SIZES=$(shell size -B -d memtest_shared | grep memtest_shared))
diff --git a/build64/Makefile b/build64/Makefile
index 4457013..f0ef164 100644
--- a/build64/Makefile
+++ b/build64/Makefile
@@ -1,5 +1,6 @@
 AS = as -64
 CC = gcc
+OBJCOPY = objcopy
 
 GIT = git
 
@@ -141,7 +142,7 @@ memtest_shared: $(OBJS) ldscripts/memtest_shared.lds Makefile
 	$(LD) -shared -Bsymbolic -T ldscripts/memtest_shared.lds -o $@ $(OBJS)
 
 memtest_shared.bin: memtest_shared
-	objcopy -O binary $< memtest_shared.bin
+	$(OBJCOPY) -O binary $< memtest_shared.bin
 
 memtest.bin: memtest_shared.bin boot/bootsect.o boot/setup.o ldscripts/memtest_bin.lds
 	$(eval SIZES=$(shell size -B -d memtest_shared | grep memtest_shared))