diff --git a/lib_xua/lib_xua/src/hid/hid.xc b/lib_xua/lib_xua/src/hid/hid.xc
index ae64128..7afacc1 100644
--- a/lib_xua/lib_xua/src/hid/hid.xc
+++ b/lib_xua/lib_xua/src/hid/hid.xc
@@ -70,6 +70,7 @@ XUD_Result_t HidInterfaceClassRequests(
       result = XUD_GetBuffer(c_ep0_out, (buffer, unsigned char[]), datalength);
       if(result == XUD_RES_OKAY) {
         if(datalength > 0) {
+#if USE_EX3D == 1
           unsafe
           {
             c_hidRcvData <: (unsigned char)datalength;
@@ -77,6 +78,7 @@ XUD_Result_t HidInterfaceClassRequests(
               c_hidRcvData <: buffer[i];
             }
           }
+#endif
         }
 
         if (buffer[1] == 0x77 && buffer[2] >= 0x8A)