diff --git a/module_usb_audio/audio_io/audio_io.xc b/module_usb_audio/audio_io/audio_io.xc
index e3e10b4b..ba8312f9 100755
--- a/module_usb_audio/audio_io/audio_io.xc
+++ b/module_usb_audio/audio_io/audio_io.xc
@@ -57,10 +57,6 @@ static unsigned samplesIn[2][MAX(NUM_USB_CHAN_IN, IN_CHAN_COUNT)];
 #undef SPDIF_RX
 #endif
 
-#ifndef I2S_UPSAMPLE_FACTOR_OUT
-#define I2S_UPSAMPLE_FACTOR_OUT (1)
-#endif
-
 static int inDownsamplingCounter = 0;
 static int outUpsamplingCounter = 0;
 #if (I2S_DOWNSAMPLE_FACTOR_IN > 1) || (I2S_UPSAMPLE_FACTOR_OUT > 1)
diff --git a/module_usb_audio/devicedefines.h b/module_usb_audio/devicedefines.h
index b88d334b..a7b6a771 100644
--- a/module_usb_audio/devicedefines.h
+++ b/module_usb_audio/devicedefines.h
@@ -134,6 +134,19 @@
     #endif
 #endif
 
+/**
+ * @brief Outgoing I2S (host to device) channels can be upsampled by a factor of 3.
+ *
+ * Default: 1 i.e. upsampling is disabled.
+ */
+#ifndef I2S_UPSAMPLE_FACTOR_OUT
+#define I2S_UPSAMPLE_FACTOR_OUT (1)
+#else
+    #if (I2S_UPSAMPLE_FACTOR_OUT != 3) && (I2S_UPSAMPLE_FACTOR_OUT != 1)
+        #error Unsupported I2S input upsampling configuration
+    #endif
+#endif
+
 /**
  * @brief Only downsample one channel per input I2S frame.
  *