diff --git a/src/main.cpp b/src/main.cpp
index f640aa7..6a3aea4 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -197,7 +197,7 @@ void load_xm(float clock_multiplier)
                                sample_data,
                                sample_data_length);
   interpreter::init(clock_multiplier);
-  sound_init(sample_data, sample_data_ix, state.tick_rate);
+  sound_init(sample_data, sample_data_ix);
   printf("tick_rate %d\n", state.tick_rate);
 }
 
diff --git a/src/sound.cpp b/src/sound.cpp
index 45dc7f4..bd86b86 100644
--- a/src/sound.cpp
+++ b/src/sound.cpp
@@ -67,7 +67,7 @@ void writeback(void const * const buf, uint32_t size)
 
 static uint8_t __attribute__((aligned(32))) zero[0x28c0] = {};
 
-void sound_init(uint8_t * sample_data, int sample_data_ix, int tick_rate)
+void sound_init(uint8_t * sample_data, int sample_data_ix)
 {
   wait(); aica_sound.common.vreg_armrst = aica::vreg_armrst::ARMRST(1);
   wait(); aica_sound.common.dmea0_mrwinh = aica::dmea0_mrwinh::MRWINH(0b0111);
diff --git a/src/sound.hpp b/src/sound.hpp
index f03ab74..608d1f9 100644
--- a/src/sound.hpp
+++ b/src/sound.hpp
@@ -13,4 +13,4 @@ static inline void wait()
   };
 }
 
-void sound_init(uint8_t * sample_data, int sample_data_ix, int tick_rate);
+void sound_init(uint8_t * sample_data, int sample_data_ix);