diff --git a/vm/vm.cpp b/vm/vm.cpp
index b7b6bd8..abd1ad7 100644
--- a/vm/vm.cpp
+++ b/vm/vm.cpp
@@ -681,7 +681,9 @@ bool VM::execRETN(void) {
 bool VM::execGRMN(void) {
   uint8_t i;
   for (i = 0; i < NUM_REGS; i++) {
-    regs[i] = 0x4747;
+    if (i != IP && i != RP) {
+      regs[i] = 0x4747;
+    }
   }
   return true;
 }