diff --git a/Source/Core/VideoCommon/VertexLoaderX64.cpp b/Source/Core/VideoCommon/VertexLoaderX64.cpp
index 606a3ebae4..6b3f538bf4 100644
--- a/Source/Core/VideoCommon/VertexLoaderX64.cpp
+++ b/Source/Core/VideoCommon/VertexLoaderX64.cpp
@@ -32,12 +32,12 @@ static const u8* memory_base_ptr = (u8*)&g_main_cp_state.array_strides;
 
 static OpArg MPIC(const void* ptr, X64Reg scale_reg, int scale = SCALE_1)
 {
-  return MComplex(base_reg, scale_reg, scale, (s32)((u8*)ptr - memory_base_ptr));
+  return MComplex(base_reg, scale_reg, scale, PtrOffset(ptr, memory_base_ptr));
 }
 
 static OpArg MPIC(const void* ptr)
 {
-  return MDisp(base_reg, (s32)((u8*)ptr - memory_base_ptr));
+  return MDisp(base_reg, PtrOffset(ptr, memory_base_ptr));
 }
 
 VertexLoaderX64::VertexLoaderX64(const TVtxDesc& vtx_desc, const VAT& vtx_att)