diff --git a/firmware/drivers/button.c b/firmware/drivers/button.c
index 7c5858a1e3..dcf77ff661 100644
--- a/firmware/drivers/button.c
+++ b/firmware/drivers/button.c
@@ -256,7 +256,8 @@ static void button_tick(void)
     lastbtn = btn & ~(BUTTON_REL | BUTTON_REPEAT);
 }
 
-void button_boost(bool state)
+#ifdef HAVE_ADJUSTABLE_CPU_FREQ
+static void button_boost(bool state)
 {
     static bool boosted = false;
     
@@ -271,17 +272,20 @@ void button_boost(bool state)
         boosted = false;
     }
 }
+#endif /* HAVE_ADJUSTABLE_CPU_FREQ */
 
 long button_get(bool block)
 {
     struct event ev;
     int pending_count = queue_count(&button_queue);
-    
+
+#ifdef HAVE_ADJUSTABLE_CPU_FREQ
     /* Control the CPU boost trying to keep queue empty. */
     if (pending_count == 0)
         button_boost(false);
     else if (pending_count > 2)
         button_boost(true);
+#endif
     
     if ( block || pending_count )
     {
@@ -296,11 +300,13 @@ long button_get_w_tmo(int ticks)
 {
     struct event ev;
     
+#ifdef HAVE_ADJUSTABLE_CPU_FREQ
     /* Be sure to keep boosted state. */
     if (!queue_empty(&button_queue))
         return button_get(true);
     
     button_boost(false);
+#endif
     
     queue_wait_w_tmo(&button_queue, &ev, ticks);
     return (ev.id != SYS_TIMEOUT)? ev.id: BUTTON_NONE;