diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7a3b3b32..d7491cf4 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -17,6 +17,7 @@ option( ENABLE_DEBUGGER "Enable the debugger" ON )
 option( ENABLE_NLS "Enable translations" ON )
 option( ENABLE_ASM_CORE "Enable x86 ASM CPU cores" OFF )
 option( ENABLE_ASM_SCALERS "Enable x86 ASM graphic filters" OFF )
+option( ENABLE_MMX "Enable MMX" OFF )
 option( ENABLE_LINK "Enable GBA linking functionality" ON )
 option( ENABLE_LIRC "Enable LIRC support" OFF )
 option( ENABLE_FFMPEG "Enable ffmpeg A/V recording" OFF )
diff --git a/src/filters/interframe.cpp b/src/filters/interframe.cpp
index f79607ea..b57beb48 100644
--- a/src/filters/interframe.cpp
+++ b/src/filters/interframe.cpp
@@ -6,6 +6,10 @@
 
 #ifdef MMX
 extern "C" bool cpu_mmx;
+static void SmartIB_MMX(u8 *srcPtr, u32 srcPitch, int width, int starty, int height);
+static void SmartIB32_MMX(u8 *srcPtr, u32 srcPitch, int width, int starty, int height);
+static void MotionBlurIB_MMX(u8 *srcPtr, u32 srcPitch, int width, int starty, int height);
+static void MotionBlurIB32_MMX(u8 *srcPtr, u32 srcPitch, int width, int starty, int height);
 #endif
 
 /*
@@ -20,7 +24,7 @@ static u8 *frm3 = NULL;
 
 extern u32 qRGB_COLOR_MASK[2];
 
-static void Init()
+void Init()
 {
   frm1 = (u8 *)calloc(322*242,4);
   // 1 frame ago
diff --git a/src/filters/interframe.hpp b/src/filters/interframe.hpp
index e2a1443b..13248f13 100644
--- a/src/filters/interframe.hpp
+++ b/src/filters/interframe.hpp
@@ -7,8 +7,6 @@
 
 extern int RGB_LOW_BITS_MASK;
 
-static void Init();
-
 // call ifc to ignore previous frame / when starting new
 void InterframeCleanup();
 
@@ -18,12 +16,6 @@ void SmartIB32(u8 *srcPtr, u32 srcPitch, int width, int starty, int height);
 void MotionBlurIB(u8 *srcPtr, u32 srcPitch, int width, int starty, int height);
 void MotionBlurIB32(u8 *srcPtr, u32 srcPitch, int width, int starty, int height);
 
-#ifdef MMX
-static void SmartIB_MMX(u8 *srcPtr, u32 srcPitch, int width, int starty, int height);
-static void SmartIB32_MMX(u8 *srcPtr, u32 srcPitch, int width, int starty, int height);
-static void MotionBlurIB_MMX(u8 *srcPtr, u32 srcPitch, int width, int starty, int height);
-static void MotionBlurIB32_MMX(u8 *srcPtr, u32 srcPitch, int width, int starty, int height);
-#endif
 
 //Options for if starty is 0
 void SmartIB(u8 *srcPtr, u32 srcPitch, int width, int height);