2 files changed, 3 insertions, 3 deletions

diff --git a/uisimulator/sdl/sound.c b/uisimulator/sdl/sound.c
index a95b19d417..6d181d2f57 100644
--- a/uisimulator/sdl/sound.c
+++ b/uisimulator/sdl/sound.c
@@ -51,7 +51,7 @@ static void sdl_dma_start(const void *addr, size_t size)
     SDL_PauseAudio(0);
 }
 
-static void sdl_dma_stop() 
+static void sdl_dma_stop(void) 
 {
     pcm_playing = false;
 
diff --git a/uisimulator/sdl/uisdl.c b/uisimulator/sdl/uisdl.c
index efa623a180..b0b422f910 100644
--- a/uisimulator/sdl/uisdl.c
+++ b/uisimulator/sdl/uisdl.c
@@ -101,7 +101,7 @@ void gui_message_loop(void)
     }
 }
 
-bool gui_startup()
+bool gui_startup(void)
 {
     SDL_Surface *picture_surface;
     int width, height;
@@ -162,7 +162,7 @@ bool gui_startup()
     return true;
 }
 
-bool gui_shutdown()
+bool gui_shutdown(void)
 {
     int i;