diff --git a/src/portable/dialog/da146xx/dcd_da146xx.c b/src/portable/dialog/da146xx/dcd_da146xx.c
index b98a996e..6eaba709 100644
--- a/src/portable/dialog/da146xx/dcd_da146xx.c
+++ b/src/portable/dialog/da146xx/dcd_da146xx.c
@@ -939,6 +939,7 @@ void dcd_edpt_close(uint8_t rhport, uint8_t ep_addr)
       }
     }
   }
+  tu_memclr(xfer, sizeof(*xfer));
 }
 
 bool dcd_edpt_xfer(uint8_t rhport, uint8_t ep_addr, uint8_t * buffer, uint16_t total_bytes)