diff --git a/src/portable/st/synopsys/dcd_synopsys.c b/src/portable/st/synopsys/dcd_synopsys.c
index c15694eb..e36c2ba2 100644
--- a/src/portable/st/synopsys/dcd_synopsys.c
+++ b/src/portable/st/synopsys/dcd_synopsys.c
@@ -519,7 +519,7 @@ void dcd_int_disable (uint8_t rhport)
 void dcd_set_address (uint8_t rhport, uint8_t dev_addr)
 {
   USB_OTG_DeviceTypeDef * dev = DEVICE_BASE(rhport);
-  dev->DCFG |= (dev_addr << USB_OTG_DCFG_DAD_Pos) & USB_OTG_DCFG_DAD_Msk;
+  dev->DCFG = (dev->DCFG & ~USB_OTG_DCFG_DAD_Msk) | (dev_addr << USB_OTG_DCFG_DAD_Pos);
 
   // Response with status after changing device address
   dcd_edpt_xfer(rhport, tu_edpt_addr(0, TUSB_DIR_IN), NULL, 0);