diff --git a/firmware/apps/geiger.c b/firmware/apps/geiger.c
index 5ae6279..f07836a 100644
--- a/firmware/apps/geiger.c
+++ b/firmware/apps/geiger.c
@@ -6,7 +6,6 @@
 #include "../lib/bughal.h"
 #include "../lib/util.h"
 #include "../lib/music.h"
-#include "../lib/synth.h"
 #include "../lib/usart.h"
 
 /**
diff --git a/firmware/apps/led_sound.c b/firmware/apps/led_sound.c
index 0f88e54..d5a8274 100644
--- a/firmware/apps/led_sound.c
+++ b/firmware/apps/led_sound.c
@@ -6,7 +6,6 @@
 #include "../lib/bughal.h"
 #include "../lib/util.h"
 #include "../lib/music.h"
-#include "../lib/synth.h"
 #include "../lib/usart.h"
 
 static void led_sound(void)
diff --git a/firmware/apps/sound_detection.c b/firmware/apps/sound_detection.c
index 00f6e78..c814a25 100644
--- a/firmware/apps/sound_detection.c
+++ b/firmware/apps/sound_detection.c
@@ -6,7 +6,6 @@
 #include "../lib/bughal.h"
 #include "../lib/util.h"
 #include "../lib/music.h"
-#include "../lib/synth.h"
 #include "../lib/usart.h"
 
 /**