diff --git a/Core/apu.c b/Core/apu.c
index 3be92d6..9afa5c9 100644
--- a/Core/apu.c
+++ b/Core/apu.c
@@ -1008,7 +1008,7 @@ void GB_set_sample_rate(GB_gameboy_t *gb, unsigned sample_rate)
     GB_apu_update_cycles_per_sample(gb);
 }
 
-void GB_set_sample_rate_by_clocks(GB_gameboy_t *gb, unsigned cycles_per_sample)
+void GB_set_sample_rate_by_clocks(GB_gameboy_t *gb, double cycles_per_sample)
 {
 
     if (cycles_per_sample == 0) {
diff --git a/Core/apu.h b/Core/apu.h
index ee6055b..885e0ce 100644
--- a/Core/apu.h
+++ b/Core/apu.h
@@ -148,7 +148,7 @@ typedef struct {
 } GB_apu_output_t;
 
 void GB_set_sample_rate(GB_gameboy_t *gb, unsigned sample_rate);
-void GB_set_sample_rate_by_clocks(GB_gameboy_t *gb, unsigned cycles_per_sample); /* Cycles are in 8MHz units */
+void GB_set_sample_rate_by_clocks(GB_gameboy_t *gb, double cycles_per_sample); /* Cycles are in 8MHz units */
 void GB_set_highpass_filter_mode(GB_gameboy_t *gb, GB_highpass_mode_t mode);
 void GB_apu_set_sample_callback(GB_gameboy_t *gb, GB_sample_callback_t callback);
 #ifdef GB_INTERNAL