diff --git a/ARMeilleure/Instructions/InstEmitSystem32.cs b/ARMeilleure/Instructions/InstEmitSystem32.cs
index 808b4fdd7a..45783c3163 100644
--- a/ARMeilleure/Instructions/InstEmitSystem32.cs
+++ b/ARMeilleure/Instructions/InstEmitSystem32.cs
@@ -17,7 +17,8 @@ namespace ARMeilleure.Instructions
 
             if (op.Coproc != 15)
             {
-                throw new NotImplementedException($"Unknown MRC Coprocessor ID 0x{op.Coproc:X16} at 0x{op.Address:X16}.");
+                EmitUndefined(context);
+                return;
             }
 
             if (op.Opc1 != 0)
@@ -70,7 +71,8 @@ namespace ARMeilleure.Instructions
 
             if (op.Coproc != 15)
             {
-                throw new NotImplementedException($"Unknown MRC Coprocessor ID 0x{op.Coproc:X16} at 0x{op.Address:X16}.");
+                EmitUndefined(context);
+                return;
             }
 
             if (op.Opc1 != 0)
@@ -119,7 +121,8 @@ namespace ARMeilleure.Instructions
 
             if (op.Coproc != 15)
             {
-                throw new NotImplementedException($"Unknown MRC Coprocessor ID 0x{op.Coproc:X16} at 0x{op.Address:X16}.");
+                EmitUndefined(context);
+                return;
             }
 
             var opc = op.MrrcOp;
@@ -229,5 +232,11 @@ namespace ARMeilleure.Instructions
             SetFlag(context, PState.ZFlag, z);
             SetFlag(context, PState.NFlag, n);
         }
+
+        private static void EmitUndefined(ArmEmitterContext context)
+        {
+            OpCode32 op = (OpCode32)context.CurrOp;
+            context.Call(new _Void_U64_S32(NativeInterface.Undefined), Const(op.Address), Const(op.RawOpCode));
+        }
     }
 }