diff --git a/libraries/AP_HAL_ChibiOS/I2CDevice.cpp b/libraries/AP_HAL_ChibiOS/I2CDevice.cpp
index 61d871bbcc..b78ce19c05 100644
--- a/libraries/AP_HAL_ChibiOS/I2CDevice.cpp
+++ b/libraries/AP_HAL_ChibiOS/I2CDevice.cpp
@@ -280,6 +280,9 @@ bool I2CDevice::_transfer(const uint8_t *send, uint32_t send_len,
             break;
         }
 
+        AP_HAL::Util::PersistentData &pd = hal.util->persistent_data;
+        pd.i2c_isr_count += I2CD[bus.busnum].i2c->isr_count;
+
         if (ret == MSG_OK) {
             bus.bouncebuffer_finish(send, recv, recv_len);
             i2cReleaseBus(I2CD[bus.busnum].i2c);