diff --git a/libraries/Wire/Wire.cpp b/libraries/Wire/Wire.cpp
index 155ab4fc8..954f8c3af 100644
--- a/libraries/Wire/Wire.cpp
+++ b/libraries/Wire/Wire.cpp
@@ -170,10 +170,10 @@ void arduino::MbedI2C::receiveThd() {
break;
case mbed::I2CSlave::WriteGeneral:
case mbed::I2CSlave::WriteAddressed:
- core_util_critical_section_enter();
- rxBuffer.clear();
char buf[240];
c = slave->read(buf, sizeof(buf));
+ core_util_critical_section_enter();
+ rxBuffer.clear();
for (buf_idx = 0; buf_idx < c; buf_idx++) {
if (rxBuffer.availableForStore()) {
rxBuffer.store_char(uint8_t(buf[buf_idx]));
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