diff --git a/ChocolArm64/Instruction/AInstEmitSimdArithmetic.cs b/ChocolArm64/Instruction/AInstEmitSimdArithmetic.cs
index 8663b12c1b..06844526f0 100644
--- a/ChocolArm64/Instruction/AInstEmitSimdArithmetic.cs
+++ b/ChocolArm64/Instruction/AInstEmitSimdArithmetic.cs
@@ -151,7 +151,7 @@ namespace ChocolArm64.Instruction
             {
                 EmitVectorExtractZx(Context, Op.Rn, Index, 0);
 
-                Context.Emit(OpCodes.Conv_U1);
+                Context.Emit(OpCodes.Conv_U4);
 
                 ASoftFallback.EmitCall(Context, nameof(ASoftFallback.CountSetBits8));