diff --git a/src/gba/Globals.cpp b/src/gba/Globals.cpp
index 925fd6fd..79f5308c 100644
--- a/src/gba/Globals.cpp
+++ b/src/gba/Globals.cpp
@@ -40,15 +40,15 @@ bool skipSaveGameCheats = false;
 // 0x0000 to 0x7FFF: set custom 15 bit color
 int customBackdropColor = -1;
 
-u8 *bios = NULL;
-u8 *rom = NULL;
-u8 *internalRAM = NULL;
-u8 *workRAM = NULL;
-u8 *paletteRAM = NULL;
-u8 *vram = NULL;
-u8 *pix = NULL;
-u8 *oam = NULL;
-u8 *ioMem = NULL;
+u8 *bios = 0;
+u8 *rom = 0;
+u8 *internalRAM = 0;
+u8 *workRAM = 0;
+u8 *paletteRAM = 0;
+u8 *vram = 0;
+u8 *pix = 0;
+u8 *oam = 0;
+u8 *ioMem = 0;
 
 u16 DISPCNT  = 0x0080;
 u16 DISPSTAT = 0x0000;
diff --git a/src/gtk/filters.cpp b/src/gtk/filters.cpp
index d139600d..45ef80fb 100644
--- a/src/gtk/filters.cpp
+++ b/src/gtk/filters.cpp
@@ -56,7 +56,7 @@ struct {
 }
 static const astFilters[] =
 {
-  { "None",                1, { NULL,         NULL           } },
+  { "None",                1, { 0,            0              } },
   { "2xSaI",               2, { _2xSaI,       _2xSaI32       } },
   { "Super 2xSaI",         2, { Super2xSaI,   Super2xSaI32   } },
   { "Super Eagle",         2, { SuperEagle,   SuperEagle32   } },
@@ -76,7 +76,7 @@ struct {
 }
 static const astFiltersIB[] =
 {
-  { "None",                      { NULL,         NULL           } },
+  { "None",                      { 0,            0              } },
   { "Smart interframe blending", { SmartIB,      SmartIB32      } },
   { "Interframe motion blur",    { MotionBlurIB, MotionBlurIB32 } }
 };
diff --git a/src/sdl/filters.cpp b/src/sdl/filters.cpp
index 071c21cc..7e136918 100644
--- a/src/sdl/filters.cpp
+++ b/src/sdl/filters.cpp
@@ -452,7 +452,7 @@ void sdlMakeStretcher(int width, int sizeOption)
 
 #else // C_CORE
 
-void (*sdlStretcher)(u8 *, u8*, int) = NULL;
+void (*sdlStretcher)(u8 *, u8*, int) = 0;
 
 #define SDL_CALL_STRETCHER \
        sdlStretcher(srcPtr, dstPtr, width)