diff --git a/src/PubSubClient.cpp b/src/PubSubClient.cpp
index e2e2f51..0fa420d 100755
--- a/src/PubSubClient.cpp
+++ b/src/PubSubClient.cpp
@@ -222,6 +222,7 @@ boolean PubSubClient::connect(const char *id, const char *user, const char *pass
 boolean PubSubClient::readByte(uint8_t * result) {
    uint32_t previousMillis = millis();
    while(!_client->available()) {
+     yield();
      uint32_t currentMillis = millis();
      if(currentMillis - previousMillis >= ((int32_t) MQTT_SOCKET_TIMEOUT * 1000)){
        return false;