diff --git a/module_usb_audio/audio_io/audio_io.xc b/module_usb_audio/audio_io/audio_io.xc
index d6621459..4e00b6b0 100755
--- a/module_usb_audio/audio_io/audio_io.xc
+++ b/module_usb_audio/audio_io/audio_io.xc
@@ -64,9 +64,9 @@ static union ds3Data
 {
     long long doubleWordAlignmentEnsured;
     /* [Number of I2S channels][Number of samples/phases][Taps per phase] */
-    int32_t delayLine[I2S_DOWNSAMPLE_CHANS][I2S_DOWNSAMPLE_FACTOR_IN][24];
+    int32_t delayLine[I2S_DOWNSAMPLE_CHANS_IN][I2S_DOWNSAMPLE_FACTOR_IN][24];
 } ds3Data;
-static int64_t ds3Sum[I2S_DOWNSAMPLE_CHANS];
+static int64_t ds3Sum[I2S_DOWNSAMPLE_CHANS_IN];
 #endif
 
 #if (DSD_CHANS_DAC != 0)
diff --git a/module_usb_audio/devicedefines.h b/module_usb_audio/devicedefines.h
index aa978fde..b88d334b 100644
--- a/module_usb_audio/devicedefines.h
+++ b/module_usb_audio/devicedefines.h
@@ -149,12 +149,12 @@
  * Default: The number of I2S incoming channels, or half this if mono downsampling is enabled.
  */
 #if (I2S_DOWNSAMPLE_MONO_IN == 1)
-    #define I2S_DOWNSAMPLE_CHANS (I2S_CHANS_ADC / 2)
+    #define I2S_DOWNSAMPLE_CHANS_IN (I2S_CHANS_ADC / 2)
     #if ((I2S_DOWNSAMPLE_FACTOR_IN > 1) && (I2S_MODE_TDM == 1))
         #error Mono I2S input downsampling is not avaliable in TDM mode
     #endif
 #else
-#define I2S_DOWNSAMPLE_CHANS I2S_CHANS_ADC
+#define I2S_DOWNSAMPLE_CHANS_IN I2S_CHANS_ADC
 #endif
 
 /**