diff --git a/include/vm_debug.h b/include/vm_debug.h
index 485e081..10c54d6 100644
--- a/include/vm_debug.h
+++ b/include/vm_debug.h
@@ -72,5 +72,6 @@ extern DEBUG_CMD(jump);
 extern DEBUG_CMD(printaddr);
 extern DEBUG_CMD(printstate);
 extern DEBUG_CMD(resume);
+extern DEBUG_CMD(writeaddr);
 
 #endif
diff --git a/src/vm_debug.c b/src/vm_debug.c
index a5368b4..d134f2d 100644
--- a/src/vm_debug.c
+++ b/src/vm_debug.c
@@ -192,3 +192,9 @@ DEBUG_CMD(jump)
     mos6502 *cpu = (mos6502 *)vm_di_get(VM_CPU);
     cpu->PC = args->addr1;
 }
+
+DEBUG_CMD(writeaddr)
+{
+    mos6502 *cpu = (mos6502 *)vm_di_get(VM_CPU);
+    mos6502_set(cpu, args->addr1, args->addr2);
+}
diff --git a/tests/vm_debug.c b/tests/vm_debug.c
index 3628816..5eb1fc4 100644
--- a/tests/vm_debug.c
+++ b/tests/vm_debug.c
@@ -109,9 +109,18 @@ Test(vm_debug, cmd_printaddr)
     cr_assert_str_eq(buf, "$7F\n");
 }
 
-Test(vm_debug, jump)
+Test(vm_debug, cmd_jump)
 {
     args.addr1 = 123;
     vm_debug_cmd_jump(&args);
     cr_assert_eq(mach->cpu->PC, 123);
 }
+
+Test(vm_debug, cmd_writeaddr)
+{
+    args.addr1 = 123;
+    args.addr2 = 0xf5;
+
+    vm_debug_cmd_writeaddr(&args);
+    cr_assert_eq(mos6502_get(mach->cpu, args.addr1), args.addr2);
+}