diff --git a/src/sound/snd_optimc.c b/src/sound/snd_optimc.c
index d8c8784fb..45010f087 100644
--- a/src/sound/snd_optimc.c
+++ b/src/sound/snd_optimc.c
@@ -157,7 +157,7 @@ optimc_reg_write(uint16_t addr, uint8_t val, void *p)
                 if (val != old) {
                     optimc->cur_mode = optimc->cur_wss_enabled = !!(val & 0x80);
 
-                    if (ctx) /* WSS */
+                    if (optimc->cur_wss_enabled) /* WSS */
                         sound_set_cd_audio_filter(ad1848_filter_cd_audio, &optimc->ad1848);
                     else /* SBPro */
                         sound_set_cd_audio_filter(sbpro_filter_cd_audio, optimc->sb);