diff --git a/Source/Core/Core/DSP/DSPCore.cpp b/Source/Core/Core/DSP/DSPCore.cpp
index 428cd09fd3..5a0b06ad3d 100644
--- a/Source/Core/Core/DSP/DSPCore.cpp
+++ b/Source/Core/Core/DSP/DSPCore.cpp
@@ -331,7 +331,7 @@ void CompileCurrent()
   }
 }
 
-u16 DSPCore_ReadRegister(int reg)
+u16 DSPCore_ReadRegister(size_t reg)
 {
   switch (reg)
   {
@@ -388,7 +388,7 @@ u16 DSPCore_ReadRegister(int reg)
   }
 }
 
-void DSPCore_WriteRegister(int reg, u16 val)
+void DSPCore_WriteRegister(size_t reg, u16 val)
 {
   switch (reg)
   {
diff --git a/Source/Core/Core/DSP/DSPCore.h b/Source/Core/Core/DSP/DSPCore.h
index b270b0117a..c6ac49eb99 100644
--- a/Source/Core/Core/DSP/DSPCore.h
+++ b/Source/Core/Core/DSP/DSPCore.h
@@ -7,6 +7,7 @@
 
 #include <array>
 #include <atomic>
+#include <cstddef>
 #include <memory>
 #include <string>
 
@@ -358,5 +359,5 @@ DSPCoreState DSPCore_GetState();
 
 void DSPCore_Step();
 
-u16 DSPCore_ReadRegister(int reg);
-void DSPCore_WriteRegister(int reg, u16 val);
+u16 DSPCore_ReadRegister(size_t reg);
+void DSPCore_WriteRegister(size_t reg, u16 val);
diff --git a/Source/Core/DolphinWX/Debugger/DSPRegisterView.cpp b/Source/Core/DolphinWX/Debugger/DSPRegisterView.cpp
index 4f0d6fb2d3..65fdc2b9ca 100644
--- a/Source/Core/DolphinWX/Debugger/DSPRegisterView.cpp
+++ b/Source/Core/DolphinWX/Debugger/DSPRegisterView.cpp
@@ -13,7 +13,7 @@
 
 wxString CDSPRegTable::GetValue(int row, int col)
 {
-  if (row < 32)  // 32 "normal" regs
+  if (row < GetNumberRows())
   {
     switch (col)
     {
@@ -41,10 +41,12 @@ void CDSPRegTable::UpdateCachedRegs()
 
   m_CachedCounter = g_dsp.step_counter;
 
-  for (int i = 0; i < 32; ++i)
+  for (size_t i = 0; i < m_CachedRegs.size(); ++i)
   {
-    m_CachedRegHasChanged[i] = (m_CachedRegs[i] != DSPCore_ReadRegister(i));
-    m_CachedRegs[i] = DSPCore_ReadRegister(i);
+    const u16 value = DSPCore_ReadRegister(i);
+
+    m_CachedRegHasChanged[i] = m_CachedRegs[i] != value;
+    m_CachedRegs[i] = value;
   }
 }