diff --git a/Source/Core/Core/HW/Memmap.cpp b/Source/Core/Core/HW/Memmap.cpp
index e9b78f6383..1eb7ef629d 100644
--- a/Source/Core/Core/HW/Memmap.cpp
+++ b/Source/Core/Core/HW/Memmap.cpp
@@ -75,7 +75,6 @@ static u32 s_fakevmem_size;
 static u32 s_fakevmem_mask;
 static u32 s_L1_cache_size;
 static u32 s_L1_cache_mask;
-static u32 s_io_size;
 // s_exram_size is the amount allocated by the emulator, whereas s_exram_size_real
 // is what gets used by emulated software.  If using retail IOS, it will
 // always be set to 64MB.
@@ -111,10 +110,6 @@ u32 GetL1CacheMask()
 {
   return s_L1_cache_mask;
 }
-u32 GetIOSize()
-{
-  return s_io_size;
-}
 u32 GetExRamSizeReal()
 {
   return s_exram_size_real;
@@ -247,7 +242,6 @@ void Init()
   s_fakevmem_mask = GetFakeVMemSize() - 1;
   s_L1_cache_size = 0x00040000;
   s_L1_cache_mask = GetL1CacheSize() - 1;
-  s_io_size = 0x00010000;
   s_exram_size_real = get_mem2_size();
   s_exram_size = MathUtil::NextPowerOf2(GetExRamSizeReal());
   s_exram_mask = GetExRamSize() - 1;
diff --git a/Source/Core/Core/HW/Memmap.h b/Source/Core/Core/HW/Memmap.h
index 32065f2053..9ff859cc64 100644
--- a/Source/Core/Core/HW/Memmap.h
+++ b/Source/Core/Core/HW/Memmap.h
@@ -45,7 +45,6 @@ u32 GetFakeVMemSize();
 u32 GetFakeVMemMask();
 u32 GetL1CacheSize();
 u32 GetL1CacheMask();
-u32 GetIOSize();
 u32 GetExRamSizeReal();
 u32 GetExRamSize();
 u32 GetExRamMask();