diff --git a/src/portable/synopsys/dwc2/dcd_dwc2.c b/src/portable/synopsys/dwc2/dcd_dwc2.c
index c71f38d2d..01b74d05e 100644
--- a/src/portable/synopsys/dwc2/dcd_dwc2.c
+++ b/src/portable/synopsys/dwc2/dcd_dwc2.c
@@ -796,7 +796,7 @@ static void dcd_edpt_disable (uint8_t rhport, uint8_t ep_addr, bool stall)
     }
 
     // Flush the FIFO, and wait until we have confirmed it cleared.
-    dwc2->grstctl |= (epnum << GRSTCTL_TXFNUM_Pos);
+    dwc2->grstctl = (epnum << GRSTCTL_TXFNUM_Pos);
     dwc2->grstctl |= GRSTCTL_TXFFLSH;
     while ( (dwc2->grstctl & GRSTCTL_TXFFLSH_Msk) != 0 ) {}
   }