diff --git a/src/sky9x/coproc_driver.cpp b/src/sky9x/coproc_driver.cpp
index 2327383b2..b06c9dd06 100644
--- a/src/sky9x/coproc_driver.cpp
+++ b/src/sky9x/coproc_driver.cpp
@@ -269,7 +269,8 @@ extern "C" void TWI0_IRQHandler()
     }
   }
 
-  TWI0->TWI_IDR = TWI_IDR_TXCOMP | TWI_IDR_TXBUFE | TWI_PTCR_TXTDIS ;
+  TWI0->TWI_IDR = TWI_IDR_TXCOMP | TWI_IDR_TXBUFE | TWI_IDR_RXBUFF ;
+  TWI0->TWI_PTCR = TWI_PTCR_TXTDIS | TWI_PTCR_RXTDIS ; // Stop transfers
   if ( TWI0->TWI_SR & TWI_SR_NACK )
   {
   }