diff --git a/src/xenia/kernel/xboxkrnl/xboxkrnl_audio_xma.cc b/src/xenia/kernel/xboxkrnl/xboxkrnl_audio_xma.cc
index 0fc5be3d5..07694e45b 100644
--- a/src/xenia/kernel/xboxkrnl/xboxkrnl_audio_xma.cc
+++ b/src/xenia/kernel/xboxkrnl/xboxkrnl_audio_xma.cc
@@ -80,9 +80,13 @@ DECLARE_XBOXKRNL_EXPORT2(XMAReleaseContext, kAudio, kImplemented,
 
 void StoreXmaContextIndexedRegister(KernelState* kernel_state,
                                     uint32_t base_reg, uint32_t context_ptr) {
+  uint32_t context_physical_address =
+      kernel_memory()->GetPhysicalAddress(context_ptr);
+  assert_true(context_physical_address != UINT32_MAX);
   auto xma_decoder = kernel_state->emulator()->audio_system()->xma_decoder();
-  uint32_t hw_index = (context_ptr - xma_decoder->context_array_ptr()) /
-                      sizeof(XMA_CONTEXT_DATA);
+  uint32_t hw_index =
+      (context_physical_address - xma_decoder->context_array_ptr()) /
+      sizeof(XMA_CONTEXT_DATA);
   uint32_t reg_num = base_reg + (hw_index >> 5) * 4;
   uint32_t reg_value = 1 << (hw_index & 0x1F);
   xma_decoder->WriteRegister(reg_num, xe::byte_swap(reg_value));
@@ -119,6 +123,9 @@ dword_result_t XMAInitializeContext(lpvoid_t context_ptr,
 
   XMA_CONTEXT_DATA context(context_ptr);
 
+  // input_buffer_0_ptr, input_buffer_1_ptr and output_buffer_ptr are physical
+  // already and good enough for us, checked in sk8er boi simulators skate. and
+  // Tony Hawk's American Wasteland. Can be 0 also (in THAW).
   context.input_buffer_0_ptr = context_init->input_buffer_0_ptr;
   context.input_buffer_0_packet_count =
       context_init->input_buffer_0_packet_count;