diff --git a/include/SDL_touch.h b/include/SDL_touch.h
index 55176a1d9..0b014d6bd 100644
--- a/include/SDL_touch.h
+++ b/include/SDL_touch.h
@@ -60,7 +60,7 @@ typedef struct SDL_Finger
 /**
  *  \brief Get the number of registered touch devices.
  */
-extern DECLSPEC int SDLCALL SDL_GetNumTouchDevices();
+extern DECLSPEC int SDLCALL SDL_GetNumTouchDevices(void);
 
 /**
  *  \brief Get the touch ID with the given index, or 0 if the index is invalid.
diff --git a/src/events/SDL_touch.c b/src/events/SDL_touch.c
index c2bb22ece..6fca4038d 100644
--- a/src/events/SDL_touch.c
+++ b/src/events/SDL_touch.c
@@ -39,7 +39,7 @@ SDL_TouchInit(void)
 }
 
 int
-SDL_GetNumTouchDevices()
+SDL_GetNumTouchDevices(void)
 {
     return SDL_num_touch;
 }