diff --git a/module_usb_audio/devicedefines.h b/module_usb_audio/devicedefines.h
index c4d9a2aa..53043dad 100644
--- a/module_usb_audio/devicedefines.h
+++ b/module_usb_audio/devicedefines.h
@@ -838,7 +838,7 @@
  * Default: STREAM_FORMAT_INPUT_1_RESOLUTION_BITS / 8
  */
 #ifndef FS_STREAM_FORMAT_INPUT_1_SUBSLOT_BYTES
-    #define FS_STREAM_FORMAT_INPUT_1_SUBSLOT_BYTES         (FS_STREAM_FORMAT_INPUT_2_RESOLUTION_BITS/8)
+    #define FS_STREAM_FORMAT_INPUT_1_SUBSLOT_BYTES         (FS_STREAM_FORMAT_INPUT_1_RESOLUTION_BITS/8)
 #endif
 
 #ifndef FS_STREAM_FORMAT_INPUT_2_SUBSLOT_BYTES