2 files changed, 3 insertions, 3 deletions

diff --git a/firmware/backlight.c b/firmware/backlight.c
index d3b4580daa..1e8ef3d3ab 100644
--- a/firmware/backlight.c
+++ b/firmware/backlight.c
@@ -126,9 +126,9 @@ int backlight_get_timeout(void)
     return backlight_timeout;
 }
 
-void backlight_set_timeout(unsigned int index)
+void backlight_set_timeout(int index)
 {
-    if(index >= sizeof(backlight_timeout_value))
+    if(index >= sizeof(backlight_timeout_value) || index < 0)
         /* if given a weird value, use 0 */
         index=0;
     backlight_timeout = index; /* index in the backlight_timeout_value table */
diff --git a/firmware/export/backlight.h b/firmware/export/backlight.h
index d0bfc62e2e..d80f2bbe61 100644
--- a/firmware/export/backlight.h
+++ b/firmware/export/backlight.h
@@ -24,7 +24,7 @@ void backlight_on(void);
 void backlight_off(void);
 void backlight_tick(void);
 int  backlight_get_timeout(void);
-void backlight_set_timeout(int seconds);
+void backlight_set_timeout(int index);
 bool backlight_get_on_when_charging(void);
 void backlight_set_on_when_charging(bool yesno);
 extern const char backlight_timeout_value[];