diff --git a/desmume/src/frontend/posix/shared/ctrlssdl.cpp b/desmume/src/frontend/posix/shared/ctrlssdl.cpp
index e8d0b7154..01af0251d 100644
--- a/desmume/src/frontend/posix/shared/ctrlssdl.cpp
+++ b/desmume/src/frontend/posix/shared/ctrlssdl.cpp
@@ -30,7 +30,7 @@
 
 
 
-u16 keyboard_cfg[NB_KEYS];
+u32 keyboard_cfg[NB_KEYS];
 u16 joypad_cfg[NB_KEYS];
 u16 nbr_joy;
 mouse_status mouse;
@@ -171,7 +171,7 @@ u16 lookup_joy_key (u16 keyval) {
 }
 
 /* Return keypad vector with given key set to 1 */
-u16 lookup_key (u16 keyval) {
+u32 lookup_key (u32 keyval) {
   int i;
   u16 Key = 0;
 
diff --git a/desmume/src/frontend/posix/shared/ctrlssdl.h b/desmume/src/frontend/posix/shared/ctrlssdl.h
index 916c4d45e..41f2e3827 100644
--- a/desmume/src/frontend/posix/shared/ctrlssdl.h
+++ b/desmume/src/frontend/posix/shared/ctrlssdl.h
@@ -64,7 +64,7 @@
 /* Keypad key names */
 extern const char *key_names[NB_KEYS];
 /* Current keyboard configuration */
-extern u16 keyboard_cfg[NB_KEYS];
+extern u32 keyboard_cfg[NB_KEYS];
 /* Current joypad configuration */
 extern u16 joypad_cfg[NB_KEYS];
 /* Number of detected joypads */
@@ -103,7 +103,7 @@ u16 get_joy_key(int index);
 u16 get_set_joy_key(int index);
 void update_keypad(u16 keys);
 u16 get_keypad( void);
-u16 lookup_key (u16 keyval);
+u32 lookup_key (u32 keyval);
 u16 lookup_joy_key (u16 keyval);
 void
 process_ctrls_event( SDL_Event& event,