diff --git a/src/gba/gba-input.c b/src/gba/gba-input.c
index 4641626c6..efa1faf2d 100644
--- a/src/gba/gba-input.c
+++ b/src/gba/gba-input.c
@@ -75,6 +75,7 @@ void GBAInputBindKey(struct GBAInputMap* map, uint32_t type, int key, enum GBAKe
 				map->maps[m].type = 0;
 				map->maps[m].map = 0;
 			}
+			map->numMaps *= 2;
 			impl = &map->maps[m];
 			impl->type = type;
 			impl->map = calloc(GBA_KEY_MAX, sizeof(enum GBAKey));
diff --git a/src/platform/sdl/sdl-events.c b/src/platform/sdl/sdl-events.c
index d664a52ef..bf581e2ad 100644
--- a/src/platform/sdl/sdl-events.c
+++ b/src/platform/sdl/sdl-events.c
@@ -14,9 +14,6 @@
 #define GUI_MOD KMOD_CTRL
 #endif
 
-#define SDL_BINDING_KEY 0x53444C4B
-#define SDL_BINDING_BUTTON 0x53444C42
-
 bool GBASDLInitEvents(struct GBASDLEvents* context) {
 	if (SDL_InitSubSystem(SDL_INIT_JOYSTICK) < 0) {
 		return false;
diff --git a/src/platform/sdl/sdl-events.h b/src/platform/sdl/sdl-events.h
index a280aae69..42010c7bf 100644
--- a/src/platform/sdl/sdl-events.h
+++ b/src/platform/sdl/sdl-events.h
@@ -7,6 +7,9 @@
 
 #include <SDL.h>
 
+#define SDL_BINDING_KEY 0x53444C4B
+#define SDL_BINDING_BUTTON 0x53444C42
+
 struct GBAVideoSoftwareRenderer;
 
 struct GBASDLEvents {