diff --git a/uisimulator/common/io.c b/uisimulator/common/io.c
index 1fdc2ef8c8..a5353af5e5 100644
--- a/uisimulator/common/io.c
+++ b/uisimulator/common/io.c
@@ -120,7 +120,7 @@ struct sim_dirent *sim_readdir(MYDIR *dir)
     if(!x11)
         return (struct sim_dirent *)0;
 
-    strcpy(secret.d_name, x11->d_name);
+    strcpy((char *)secret.d_name, x11->d_name);
 
     /* build file name */
     sprintf(buffer, SIMULATOR_ARCHOS_ROOT "%s/%s",
diff --git a/uisimulator/x11/screenhack.c b/uisimulator/x11/screenhack.c
index 162e0ca82a..4cd2802aa2 100644
--- a/uisimulator/x11/screenhack.c
+++ b/uisimulator/x11/screenhack.c
@@ -272,7 +272,7 @@ int screenhack_handle_event(XEvent *event, bool *release)
             {
                 KeySym keysym;
                 unsigned char c = 0;
-                XLookupString (&event->xkey, &c, 1, &keysym, 0);
+                XLookupString (&event->xkey, (char *)&c, 1, &keysym, 0);
                 key = keysym;
 #if 0
                 DEBUGF("Got keypress: %c (%02x) %x, tick %ld\n", c, c,
@@ -284,7 +284,7 @@ int screenhack_handle_event(XEvent *event, bool *release)
             {
                 KeySym keysym;
                 unsigned char c = 0;
-                XLookupString (&event->xkey, &c, 1, &keysym, 0);
+                XLookupString (&event->xkey, (char *)&c, 1, &keysym, 0);
                 key = keysym;
 #if 0
                 DEBUGF("Got keyrelease: %c (%02x) %x, tick %ld\n", c, c,
diff --git a/uisimulator/x11/sound.c b/uisimulator/x11/sound.c
index c21615b46d..dd875e41f5 100644
--- a/uisimulator/x11/sound.c
+++ b/uisimulator/x11/sound.c
@@ -84,7 +84,7 @@ void sound_playback_thread(void)
                 sound_get_pcm = NULL;
                 break;
             }
-            sim_sound_play(soundfd, buf, size);
+            sim_sound_play(soundfd, (char *)buf, size);
             usleep(10000);
         } while(size);