diff --git a/Source/Core/Common/x64Emitter.cpp b/Source/Core/Common/x64Emitter.cpp
index 206a48196e..6a04e2b20d 100644
--- a/Source/Core/Common/x64Emitter.cpp
+++ b/Source/Core/Common/x64Emitter.cpp
@@ -151,7 +151,7 @@ void OpArg::WriteRex(XEmitter *emit, int opBits, int bits, int customOp) const
 	}
 }
 
-void OpArg::WriteVex(XEmitter* emit, int size, int packed, Gen::X64Reg regOp1, Gen::X64Reg regOp2) const
+void OpArg::WriteVex(XEmitter* emit, int size, bool packed, Gen::X64Reg regOp1, Gen::X64Reg regOp2) const
 {
 	int R = !(regOp1 & 8);
 	int X = !(indexReg & 8);
diff --git a/Source/Core/Common/x64Emitter.h b/Source/Core/Common/x64Emitter.h
index 020954a33d..1d220a30b0 100644
--- a/Source/Core/Common/x64Emitter.h
+++ b/Source/Core/Common/x64Emitter.h
@@ -123,7 +123,7 @@ struct OpArg
 		offset = _offset;
 	}
 	void WriteRex(XEmitter *emit, int opBits, int bits, int customOp = -1) const;
-	void WriteVex(XEmitter* emit, int size, int packed, Gen::X64Reg regOp1, X64Reg regOp2) const;
+	void WriteVex(XEmitter* emit, int size, bool packed, Gen::X64Reg regOp1, X64Reg regOp2) const;
 	void WriteRest(XEmitter *emit, int extraBytes=0, X64Reg operandReg=(X64Reg)0xFF, bool warn_64bit_offset = true) const;
 	void WriteFloatModRM(XEmitter *emit, FloatOp op);
 	void WriteSingleByteOp(XEmitter *emit, u8 op, X64Reg operandReg, int bits);