diff --git a/desmume/src/frontend/interface/draw_sdl_window.cpp b/desmume/src/frontend/interface/draw_sdl_window.cpp
index 8da5d3d1b..53b1a9ccb 100755
--- a/desmume/src/frontend/interface/draw_sdl_window.cpp
+++ b/desmume/src/frontend/interface/draw_sdl_window.cpp
@@ -255,7 +255,6 @@ EXPORTED int desmume_draw_window_init(BOOL auto_pause, BOOL use_opengl_if_possib
     // TODO: Make configurable instead.
     load_default_config(cli_kb_cfg);
 
-    ctrls_cfg.boost = 0;
     ctrls_cfg.sdl_quit = 0;
     ctrls_cfg.auto_pause = auto_pause;
     ctrls_cfg.focused = 1;
diff --git a/desmume/src/frontend/posix/cli/main.cpp b/desmume/src/frontend/posix/cli/main.cpp
index b61844763..45f12e1e4 100644
--- a/desmume/src/frontend/posix/cli/main.cpp
+++ b/desmume/src/frontend/posix/cli/main.cpp
@@ -546,7 +546,6 @@ int main(int argc, char ** argv) {
   osd = new OSDCLASS(-1);
 #endif
 
-  ctrls_cfg.boost = 0;
   ctrls_cfg.sdl_quit = 0;
   ctrls_cfg.auto_pause = my_config.auto_pause;
   ctrls_cfg.focused = 1;
@@ -577,7 +576,7 @@ int main(int argc, char ** argv) {
 #ifdef DISPLAY_FPS
     now = SDL_GetTicks();
 #endif
-    if ( !my_config.disable_limiter && !ctrls_cfg.boost) {
+    if ( !my_config.disable_limiter && !(ctrls_cfg.keypad & KEYMASK_(KEY_BOOST - 1))) {
 #ifndef DISPLAY_FPS
       now = SDL_GetTicks();
 #endif
diff --git a/desmume/src/frontend/posix/shared/ctrlssdl.cpp b/desmume/src/frontend/posix/shared/ctrlssdl.cpp
index 30a4477b4..169dba6f6 100644
--- a/desmume/src/frontend/posix/shared/ctrlssdl.cpp
+++ b/desmume/src/frontend/posix/shared/ctrlssdl.cpp
@@ -430,7 +430,6 @@ do_process_joystick_events( u16 *keypad, SDL_Event *event) {
       break;
 
       /* Joystick button pressed */
-      /* FIXME: Add support for BOOST */
     case SDL_JOYBUTTONDOWN:
       key_code = ((event->jbutton.which & 15) << 12) | JOY_BUTTON << 8 | (event->jbutton.button & 255);
       key = lookup_joy_key( key_code );
@@ -536,15 +535,6 @@ process_ctrls_event( SDL_Event& event,
                   driver->AddLine("Fake mic disabled");
                 break;
 #endif
-
-            case SDLK_o:
-                cfg->boost = !cfg->boost;
-                if (cfg->boost)
-                  driver->AddLine("Boost mode enabled");
-                else
-                  driver->AddLine("Boost mode disabled");
-                break;
-
             case SDLK_LSHIFT:
                 shift_pressed &= ~1;
                 break;
diff --git a/desmume/src/frontend/posix/shared/ctrlssdl.h b/desmume/src/frontend/posix/shared/ctrlssdl.h
index a56c42b93..8d37029dc 100644
--- a/desmume/src/frontend/posix/shared/ctrlssdl.h
+++ b/desmume/src/frontend/posix/shared/ctrlssdl.h
@@ -89,7 +89,6 @@ struct ctrls_event_config {
   int auto_pause;
   int focused;
   int sdl_quit;
-  int boost;
   int fake_mic;
   void *screen_texture;
   void (*resize_cb)(u16 width, u16 height, void *screen_texture);