diff --git a/Source/Core/Common/CMakeLists.txt b/Source/Core/Common/CMakeLists.txt
index 063c71c4ba..669a629676 100644
--- a/Source/Core/Common/CMakeLists.txt
+++ b/Source/Core/Common/CMakeLists.txt
@@ -85,7 +85,6 @@ add_library(common
   Matrix.h
   MD5.cpp
   MD5.h
-  MemArena.cpp
   MemArena.h
   MemoryUtil.cpp
   MemoryUtil.h
@@ -185,16 +184,19 @@ if(ANDROID)
     AndroidAnalytics.cpp
     AndroidAnalytics.h
     Logging/ConsoleListenerDroid.cpp
+    MemArenaAndroid.cpp
   )
 elseif(WIN32)
   target_sources(common PRIVATE
     LdrWatcher.cpp
     LdrWatcher.h
     Logging/ConsoleListenerWin.cpp
+    MemArenaWin.cpp
   )
 else()
   target_sources(common PRIVATE
     Logging/ConsoleListenerNix.cpp
+    MemArenaUnix.cpp
   )
 endif()
 
diff --git a/Source/Core/Common/MemArena.cpp b/Source/Core/Common/MemArenaAndroid.cpp
similarity index 65%
rename from Source/Core/Common/MemArena.cpp
rename to Source/Core/Common/MemArenaAndroid.cpp
index 7d5d7ab165..053b14411f 100644
--- a/Source/Core/Common/MemArena.cpp
+++ b/Source/Core/Common/MemArenaAndroid.cpp
@@ -3,35 +3,28 @@
 
 #include "Common/MemArena.h"
 
+#include <cerrno>
 #include <cstddef>
 #include <cstdlib>
+#include <cstring>
 #include <set>
 #include <string>
 
+#include <dlfcn.h>
+#include <fcntl.h>
+#include <linux/ashmem.h>
+#include <sys/ioctl.h>
+#include <sys/mman.h>
+#include <unistd.h>
+
 #include "Common/CommonFuncs.h"
 #include "Common/CommonTypes.h"
 #include "Common/Logging/Log.h"
 #include "Common/MsgHandler.h"
 #include "Common/StringUtil.h"
 
-#ifdef _WIN32
-#include <windows.h>
-#else
-#include <cerrno>
-#include <cstring>
-#include <fcntl.h>
-#include <sys/mman.h>
-#include <unistd.h>
-#ifdef ANDROID
-#include <dlfcn.h>
-#include <linux/ashmem.h>
-#include <sys/ioctl.h>
-#endif
-#endif
-
 namespace Common
 {
-#ifdef ANDROID
 #define ASHMEM_DEVICE "/dev/ashmem"
 
 static int AshmemCreateFileMapping(const char* name, size_t size)
@@ -65,50 +58,21 @@ static int AshmemCreateFileMapping(const char* name, size_t size)
   }
   return fd;
 }
-#endif
 
 void MemArena::GrabSHMSegment(size_t size)
 {
-#ifdef _WIN32
-  const std::string name = "dolphin-emu." + std::to_string(GetCurrentProcessId());
-  hMemoryMapping = CreateFileMapping(INVALID_HANDLE_VALUE, nullptr, PAGE_READWRITE, 0,
-                                     static_cast<DWORD>(size), UTF8ToTStr(name).c_str());
-#elif defined(ANDROID)
   fd = AshmemCreateFileMapping(("dolphin-emu." + std::to_string(getpid())).c_str(), size);
   if (fd < 0)
-  {
     NOTICE_LOG_FMT(MEMMAP, "Ashmem allocation failed");
-    return;
-  }
-#else
-  const std::string file_name = "/dolphin-emu." + std::to_string(getpid());
-  fd = shm_open(file_name.c_str(), O_RDWR | O_CREAT | O_EXCL, 0600);
-  if (fd == -1)
-  {
-    ERROR_LOG_FMT(MEMMAP, "shm_open failed: {}", strerror(errno));
-    return;
-  }
-  shm_unlink(file_name.c_str());
-  if (ftruncate(fd, size) < 0)
-    ERROR_LOG_FMT(MEMMAP, "Failed to allocate low memory space");
-#endif
 }
 
 void MemArena::ReleaseSHMSegment()
 {
-#ifdef _WIN32
-  CloseHandle(hMemoryMapping);
-  hMemoryMapping = 0;
-#else
   close(fd);
-#endif
 }
 
 void* MemArena::CreateView(s64 offset, size_t size, void* base)
 {
-#ifdef _WIN32
-  return MapViewOfFileEx(hMemoryMapping, FILE_MAP_ALL_ACCESS, 0, (DWORD)((u64)offset), size, base);
-#else
   void* retval = mmap(base, size, PROT_READ | PROT_WRITE,
                       MAP_SHARED | ((base == nullptr) ? 0 : MAP_FIXED), fd, offset);
 
@@ -121,16 +85,11 @@ void* MemArena::CreateView(s64 offset, size_t size, void* base)
   {
     return retval;
   }
-#endif
 }
 
 void MemArena::ReleaseView(void* view, size_t size)
 {
-#ifdef _WIN32
-  UnmapViewOfFile(view);
-#else
   munmap(view, size);
-#endif
 }
 
 u8* MemArena::FindMemoryBase()
@@ -141,24 +100,10 @@ u8* MemArena::FindMemoryBase()
   const size_t memory_size = 0x400000000;
 #endif
 
-#ifdef _WIN32
-  u8* base = static_cast<u8*>(VirtualAlloc(nullptr, memory_size, MEM_RESERVE, PAGE_READWRITE));
-  if (!base)
-  {
-    PanicAlertFmt("Failed to map enough memory space: {}", GetLastErrorString());
-    return nullptr;
-  }
-  VirtualFree(base, 0, MEM_RELEASE);
-  return base;
-#else
-#ifdef ANDROID
   // Android 4.3 changed how mmap works.
   // if we map it private and then munmap it, we can't use the base returned.
-  // This may be due to changes in them support a full SELinux implementation.
+  // This may be due to changes in them to support a full SELinux implementation.
   const int flags = MAP_ANON | MAP_SHARED;
-#else
-  const int flags = MAP_ANON | MAP_PRIVATE;
-#endif
   void* base = mmap(nullptr, memory_size, PROT_NONE, flags, -1, 0);
   if (base == MAP_FAILED)
   {
@@ -167,7 +112,5 @@ u8* MemArena::FindMemoryBase()
   }
   munmap(base, memory_size);
   return static_cast<u8*>(base);
-#endif
 }
-
 }  // namespace Common
diff --git a/Source/Core/Common/MemArenaUnix.cpp b/Source/Core/Common/MemArenaUnix.cpp
new file mode 100644
index 0000000000..63465a5e22
--- /dev/null
+++ b/Source/Core/Common/MemArenaUnix.cpp
@@ -0,0 +1,83 @@
+// Copyright 2008 Dolphin Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "Common/MemArena.h"
+
+#include <cerrno>
+#include <cstddef>
+#include <cstdlib>
+#include <cstring>
+#include <set>
+#include <string>
+
+#include <fcntl.h>
+#include <sys/mman.h>
+#include <unistd.h>
+
+#include "Common/CommonFuncs.h"
+#include "Common/CommonTypes.h"
+#include "Common/Logging/Log.h"
+#include "Common/MsgHandler.h"
+#include "Common/StringUtil.h"
+
+namespace Common
+{
+void MemArena::GrabSHMSegment(size_t size)
+{
+  const std::string file_name = "/dolphin-emu." + std::to_string(getpid());
+  fd = shm_open(file_name.c_str(), O_RDWR | O_CREAT | O_EXCL, 0600);
+  if (fd == -1)
+  {
+    ERROR_LOG_FMT(MEMMAP, "shm_open failed: {}", strerror(errno));
+    return;
+  }
+  shm_unlink(file_name.c_str());
+  if (ftruncate(fd, size) < 0)
+    ERROR_LOG_FMT(MEMMAP, "Failed to allocate low memory space");
+}
+
+void MemArena::ReleaseSHMSegment()
+{
+  close(fd);
+}
+
+void* MemArena::CreateView(s64 offset, size_t size, void* base)
+{
+  void* retval = mmap(base, size, PROT_READ | PROT_WRITE,
+                      MAP_SHARED | ((base == nullptr) ? 0 : MAP_FIXED), fd, offset);
+
+  if (retval == MAP_FAILED)
+  {
+    NOTICE_LOG_FMT(MEMMAP, "mmap failed");
+    return nullptr;
+  }
+  else
+  {
+    return retval;
+  }
+}
+
+void MemArena::ReleaseView(void* view, size_t size)
+{
+  munmap(view, size);
+}
+
+u8* MemArena::FindMemoryBase()
+{
+#if _ARCH_32
+  const size_t memory_size = 0x31000000;
+#else
+  const size_t memory_size = 0x400000000;
+#endif
+
+  const int flags = MAP_ANON | MAP_PRIVATE;
+  void* base = mmap(nullptr, memory_size, PROT_NONE, flags, -1, 0);
+  if (base == MAP_FAILED)
+  {
+    PanicAlertFmt("Failed to map enough memory space: {}", LastStrerrorString());
+    return nullptr;
+  }
+  munmap(base, memory_size);
+  return static_cast<u8*>(base);
+}
+}  // namespace Common
diff --git a/Source/Core/Common/MemArenaWin.cpp b/Source/Core/Common/MemArenaWin.cpp
new file mode 100644
index 0000000000..e65e642028
--- /dev/null
+++ b/Source/Core/Common/MemArenaWin.cpp
@@ -0,0 +1,61 @@
+// Copyright 2008 Dolphin Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "Common/MemArena.h"
+
+#include <cstddef>
+#include <cstdlib>
+#include <set>
+#include <string>
+
+#include <windows.h>
+
+#include "Common/CommonFuncs.h"
+#include "Common/CommonTypes.h"
+#include "Common/Logging/Log.h"
+#include "Common/MsgHandler.h"
+#include "Common/StringUtil.h"
+
+namespace Common
+{
+void MemArena::GrabSHMSegment(size_t size)
+{
+  const std::string name = "dolphin-emu." + std::to_string(GetCurrentProcessId());
+  hMemoryMapping = CreateFileMapping(INVALID_HANDLE_VALUE, nullptr, PAGE_READWRITE, 0,
+                                     static_cast<DWORD>(size), UTF8ToTStr(name).c_str());
+}
+
+void MemArena::ReleaseSHMSegment()
+{
+  CloseHandle(hMemoryMapping);
+  hMemoryMapping = 0;
+}
+
+void* MemArena::CreateView(s64 offset, size_t size, void* base)
+{
+  return MapViewOfFileEx(hMemoryMapping, FILE_MAP_ALL_ACCESS, 0, (DWORD)((u64)offset), size, base);
+}
+
+void MemArena::ReleaseView(void* view, size_t size)
+{
+  UnmapViewOfFile(view);
+}
+
+u8* MemArena::FindMemoryBase()
+{
+#if _ARCH_32
+  const size_t memory_size = 0x31000000;
+#else
+  const size_t memory_size = 0x400000000;
+#endif
+
+  u8* base = static_cast<u8*>(VirtualAlloc(nullptr, memory_size, MEM_RESERVE, PAGE_READWRITE));
+  if (!base)
+  {
+    PanicAlertFmt("Failed to map enough memory space: {}", GetLastErrorString());
+    return nullptr;
+  }
+  VirtualFree(base, 0, MEM_RELEASE);
+  return base;
+}
+}  // namespace Common
diff --git a/Source/Core/DolphinLib.props b/Source/Core/DolphinLib.props
index 49d2cfe994..0940466a2a 100644
--- a/Source/Core/DolphinLib.props
+++ b/Source/Core/DolphinLib.props
@@ -726,7 +726,7 @@
     <ClCompile Include="Common\MathUtil.cpp" />
     <ClCompile Include="Common\Matrix.cpp" />
     <ClCompile Include="Common\MD5.cpp" />
-    <ClCompile Include="Common\MemArena.cpp" />
+    <ClCompile Include="Common\MemArenaWin.cpp" />
     <ClCompile Include="Common\MemoryUtil.cpp" />
     <ClCompile Include="Common\MsgHandler.cpp" />
     <ClCompile Include="Common\NandPaths.cpp" />