diff --git a/vm/vm.cpp b/vm/vm.cpp
index 4207dd3..105b844 100644
--- a/vm/vm.cpp
+++ b/vm/vm.cpp
@@ -128,7 +128,24 @@ void VM::initVariables(void) {
   }
   return;
 }
-
+bool VM::dstRegCheck(uint8_t reg) {
+  if (reg == IP || reg == SP || reg == RP) {
+    DBG_ERROR(("Invalid register!\n"));
+    return false;
+  }
+  return true;
+}
+bool VM::srcDstRegCheck(uint8_t dst, uint8_t src) {
+  if (dst == IP || dst == SP || dst == RP) {
+    DBG_ERROR(("Invalid register!\n"));
+    return false;
+  }
+  if (src == IP || src == SP || src == RP) {
+    DBG_ERROR(("Invalid register!\n"));
+    return false;
+  }
+  return true;
+}
 /*
 INSTRUCTIONS IMPLEMENTATIONS
 */
@@ -142,10 +159,8 @@ bool VM::execMOVI(void) {
   dst = as.code[regs[IP] + 1];
   imm = *((uint16_t *)&as.code[regs[IP] + 2]);
   DBG_INFO(("MOVI %s, 0x%x\n", getRegName(dst), imm));
-  if (dst == IP || dst == SP || dst == RP) {
-    DBG_ERROR(("MOVI: Invalid register!\n"));
+  if (!dstRegCheck(dst))
     return false;
-  }
   regs[dst] = imm;
   return true;
 }
@@ -160,7 +175,8 @@ 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 || dst == SP || src == SP || dst == RP || src== RP) {
+  if (dst == IP || src == IP || dst == SP || src == SP || dst == RP ||
+      src == RP) {
     DBG_ERROR(("MOVR: Invalid register!\n"));
     return false;
   }
diff --git a/vm/vm.h b/vm/vm.h
index 858ead5..4b7aa4d 100644
--- a/vm/vm.h
+++ b/vm/vm.h
@@ -16,6 +16,9 @@ private:
   ///////////////////////
   void initVariables(void);
   void encryptOpcodes(uint8_t *key);
+  bool dstRegCheck(uint8_t reg);
+  bool srcDstRegCheck(uint8_t dst, uint8_t src);
+
   /*
   DBG UTILS
   */