diff --git a/src/devices/sound/nes_apu.cpp b/src/devices/sound/nes_apu.cpp
index 69c0d9e8138..e3715dcfad6 100644
--- a/src/devices/sound/nes_apu.cpp
+++ b/src/devices/sound/nes_apu.cpp
@@ -342,7 +342,7 @@ s8 nesapu_device::apu_triangle(apu_t::triangle_t *chan)
 	if (freq < 4) /* inaudible */
 		return 0;
 
-	chan->phaseacc -= (float) m_apu_incsize; /* # of cycles per sample */
+	chan->phaseacc --;
 	while (chan->phaseacc < 0)
 	{
 		chan->phaseacc += freq;
@@ -400,7 +400,7 @@ s8 nesapu_device::apu_noise(apu_t::noise_t *chan)
 		return 0;
 
 	freq = noise_freq[chan->regs[2] & 0x0F];
-	chan->phaseacc -= (float) m_apu_incsize; /* # of cycles per sample */
+	chan->phaseacc --;
 	while (chan->phaseacc < 0)
 	{
 		chan->phaseacc += freq;
@@ -453,7 +453,7 @@ s8 nesapu_device::apu_dpcm(apu_t::dpcm_t *chan)
 	if (chan->enabled)
 	{
 		freq = dpcm_clocks[chan->regs[0] & 0x0F];
-		chan->phaseacc -= (float) m_apu_incsize; /* # of cycles per sample */
+		chan->phaseacc --;
 
 		while (chan->phaseacc < 0)
 		{
diff --git a/src/devices/sound/nes_apu.h b/src/devices/sound/nes_apu.h
index 67eb0ac4ff1..0a244540abe 100644
--- a/src/devices/sound/nes_apu.h
+++ b/src/devices/sound/nes_apu.h
@@ -74,10 +74,8 @@ private:
 
 	// internal state
 	apu_t   m_APU;                   /* Actual APUs */
-	float   m_apu_incsize;           /* Adjustment increment */
 	u32     m_samps_per_sync;        /* Number of samples per vsync */
 	u32     m_buffer_size;           /* Actual buffer size in bytes */
-	u32     m_real_rate;             /* Actual playback rate */
 	u8      m_noise_lut[apu_t::NOISE_LONG]; /* Noise sample lookup table */
 	u32     m_vbl_times[0x20];       /* VBL durations in samples */
 	u32     m_sync_times1[SYNCS_MAX1]; /* Samples per sync table */