diff --git a/src/coreclr/jit/emitxarch.cpp b/src/coreclr/jit/emitxarch.cpp
index 6d654f115ff480..f7b9df9f0c02c2 100644
--- a/src/coreclr/jit/emitxarch.cpp
+++ b/src/coreclr/jit/emitxarch.cpp
@@ -4034,8 +4034,16 @@ emitter::insFormat emitter::emitMapFmtForIns(insFormat fmt, instruction ins)
                     unreached();
             }
         }
-
         default:
+            if (IsMovInstruction(ins))
+            {
+                // A `mov` instruction is always "write"
+                // and not "read/write".
+                if (fmt == IF_RRW_ARD)
+                {
+                    return IF_RWR_ARD;
+                }
+            }
             return fmt;
     }
 }