diff --git a/Source/Core/Common/Src/Common.h b/Source/Core/Common/Src/Common.h
index 139248dfa6..bd0534987c 100644
--- a/Source/Core/Common/Src/Common.h
+++ b/Source/Core/Common/Src/Common.h
@@ -114,10 +114,6 @@ extern const char *netplay_dolphin_ver;
 #include "Config.h"	// SCons autoconfiguration defines
 #endif
 
-#ifndef __linux__
-#define MAP_32BIT 0	// MAP_32BIT is a Linux-specific mmap(2) flag
-#endif
-
 // Windows compatibility
 #ifndef _WIN32
 #include <limits.h>
diff --git a/Source/Core/Common/Src/MemoryUtil.cpp b/Source/Core/Common/Src/MemoryUtil.cpp
index 60689c1aa9..68b9f6f0fe 100644
--- a/Source/Core/Common/Src/MemoryUtil.cpp
+++ b/Source/Core/Common/Src/MemoryUtil.cpp
@@ -22,21 +22,11 @@
 #ifdef _WIN32
 #include <windows.h>
 #include <psapi.h>
-#elif __GNUC__
-#include <sys/mman.h>
+#else
 #include <errno.h>
 #include <stdio.h>
 #endif
 
-#if !defined(MAP_ANONYMOUS) && defined(MAP_ANON)
-#define MAP_ANONYMOUS MAP_ANON
-#endif 
-
-// MacOSX does not support MAP_VARIABLE
-#ifndef MAP_VARIABLE
-#define MAP_VARIABLE 0
-#endif
-
 // This is purposely not a full wrapper for virtualalloc/mmap, but it
 // provides exactly the primitive operations that Dolphin needs.
 
@@ -55,7 +45,7 @@ void* AllocateExecutableMemory(size_t size, bool low)
 
 #else
 	void* retval = mmap(0, size, PROT_READ | PROT_WRITE | PROT_EXEC,
-		MAP_ANONYMOUS | MAP_PRIVATE
+		MAP_ANON | MAP_PRIVATE
 #ifdef __x86_64__
 		 | (low ? MAP_32BIT : 0)
 #endif
@@ -86,7 +76,7 @@ void* AllocateMemoryPages(size_t size)
 
 #else
 	void* retval = mmap(0, size, PROT_READ | PROT_WRITE,
-			MAP_ANONYMOUS | MAP_PRIVATE, -1, 0); // | MAP_FIXED
+			MAP_ANON | MAP_PRIVATE, -1, 0); // | MAP_FIXED
 	// printf("Mapped memory at %p (size %i)\n", retval, size);
 
 	if (!retval)
diff --git a/Source/Core/Common/Src/MemoryUtil.h b/Source/Core/Common/Src/MemoryUtil.h
index 9db4e0a991..5262898b35 100644
--- a/Source/Core/Common/Src/MemoryUtil.h
+++ b/Source/Core/Common/Src/MemoryUtil.h
@@ -18,8 +18,16 @@
 #ifndef _MEMORYUTIL_H
 #define _MEMORYUTIL_H
 
+#ifndef _WIN32
+#include <sys/mman.h>
+#endif
 #include <string>
 
+// Linux-specific mmap(2) flag
+#ifndef MAP_32BIT
+#define MAP_32BIT 0
+#endif
+
 void* AllocateExecutableMemory(size_t size, bool low = true);
 void* AllocateMemoryPages(size_t size);
 void FreeMemoryPages(void* ptr, size_t size);