diff --git a/firmware/sound.c b/firmware/sound.c
index 84c022e0c0..d64dfcfdb9 100644
--- a/firmware/sound.c
+++ b/firmware/sound.c
@@ -149,7 +149,7 @@ void sound_set_dsp_callback(int (*func)(int, intptr_t))
 }
 #endif
 
-#if CONFIG_CODEC == MAS3507D
+#if (CONFIG_CODEC == MAS3507D) && !defined(SIMULATOR)
 /* convert tenth of dB volume (-780..+180) to dac3550 register value */
 static int tenthdb2reg(int db)
 {
diff --git a/uisimulator/sdl/sound.c b/uisimulator/sdl/sound.c
index aa689b921d..8d9dbeb743 100644
--- a/uisimulator/sdl/sound.c
+++ b/uisimulator/sdl/sound.c
@@ -379,10 +379,10 @@ void audiohw_set_channel(int value)     { (void)value; }
 void audiohw_set_stereo_width(int value){ (void)value; }
 #endif
 #if defined(AUDIOHW_HAVE_BASS_CUTOFF)
-void audiohw_set_bass_cutoff(value)     { (void)value; }
+void audiohw_set_bass_cutoff(int value) { (void)value; }
 #endif
 #if defined(AUDIOHW_HAVE_TREBLE_CUTOFF)
-void audiohw_set_treble_cutoff(value)   { (void)value; }
+void audiohw_set_treble_cutoff(int value){ (void)value; }
 #endif
 #if (CONFIG_CODEC == MAS3587F) || (CONFIG_CODEC == MAS3539F)
 int mas_codec_readreg(int reg)