diff --git a/examples/platforms/efr32mg12/radio.c b/examples/platforms/efr32mg12/radio.c
index cca42fc30..0e5c27876 100644
--- a/examples/platforms/efr32mg12/radio.c
+++ b/examples/platforms/efr32mg12/radio.c
@@ -608,6 +608,7 @@ otError otPlatRadioTransmit(otInstance *aInstance, otRadioFrame *aFrame)
 #endif
         sTransmitError = OT_ERROR_CHANNEL_ACCESS_FAILURE;
         sTransmitBusy  = false;
+        otSysEventSignalPending();
     }
 
 exit: