diff --git a/src/class/cdc/cdc.h b/src/class/cdc/cdc.h
index 842ea4dfe..4658e43af 100644
--- a/src/class/cdc/cdc.h
+++ b/src/class/cdc/cdc.h
@@ -379,7 +379,7 @@ typedef struct TU_ATTR_PACKED
     uint32_t line_state_change      : 1; ///< 0 : Does not support line state change notification. 1 : Does support line state change notification
     uint32_t TU_RESERVED0           : 2;
     uint32_t TU_RESERVED1           : 16;
-    uint32_t TU_RESERVED2           : 4;
+    uint32_t TU_RESERVED2           : 8;
   } bmCapabilities;
 }cdc_desc_func_telephone_call_state_reporting_capabilities_t;