diff --git a/Makefile b/Makefile
index b3653f9..7f6f85a 100644
--- a/Makefile
+++ b/Makefile
@@ -193,7 +193,7 @@ $(KOBJDIR)/kernel/sched.o: $(KERNELDIR)/kernel/proc/sched.c $(KERNELDIR)/include
 
 .PHONY: test
 test: all
-	@qemu-system-x86_64 -m 5G -hda $(BUILDDIR)/bin/disk.img \
+	@qemu-system-x86_64 -m 4G -hda $(BUILDDIR)/bin/disk.img \
 	-d cpu_reset,guest_errors,pcall,int 2> $(BUILDDIR)/qemu.log &
 .PHONY: test32
 test32: all