diff --git a/vm/vm.cpp b/vm/vm.cpp
index 0e487e5..4207dd3 100644
--- a/vm/vm.cpp
+++ b/vm/vm.cpp
@@ -160,8 +160,8 @@ bool VM::execMOVR(void) {
   dst = as.code[regs[IP] + 1] >> 4;
   src = as.code[regs[IP] + 1] & 0b00001111;
   DBG_INFO(("MOVR %s, %s\n", getRegName(dst), getRegName(src)));
-  if (dst == IP || src == IP) {
-    DBG_ERROR(("Can't MOVR IP!\n"));
+  if (dst == IP || src == IP || dst == SP || src == SP || dst == RP || src== RP) {
+    DBG_ERROR(("MOVR: Invalid register!\n"));
     return false;
   }
   regs[dst] = regs[src];