diff --git a/src/audio.c b/src/audio.c
index 2921384b..527113c6 100644
--- a/src/audio.c
+++ b/src/audio.c
@@ -229,7 +229,7 @@ audio_step(int cpu_clocks)
 		vera_samp_pos_hd = (vera_samp_pos_hd + max_cpu_clks * VERA_SAMP_CLKS_PER_CPU_CLK) & SAMP_POS_MASK_FRAC;
 		ym_samp_pos_hd = (ym_samp_pos_hd + max_cpu_clks * YM_SAMP_CLKS_PER_CPU_CLK) & SAMP_POS_MASK_FRAC;
 		cpu_clocks -= max_cpu_clks;
-		audio_render();
+		if (cpu_clocks > 0) audio_render();
 	}
 }
 
diff --git a/src/video.c b/src/video.c
index d7ebebcb..5c90eab3 100644
--- a/src/video.c
+++ b/src/video.c
@@ -1845,7 +1845,7 @@ uint8_t video_read(uint8_t reg, bool debugOn) {
 		case 0x19:
 		case 0x1A: return reg_layer[1][reg - 0x14];
 
-		case 0x1B: return pcm_read_ctrl();
+		case 0x1B: audio_render(); return pcm_read_ctrl();
 		case 0x1C: return pcm_read_rate();
 		case 0x1D: return 0;