diff --git a/README.md b/README.md
index c4b04fb..faa91c4 100644
--- a/README.md
+++ b/README.md
@@ -37,7 +37,7 @@ public:
 
     virtual bool onConnect(IPAddress addr, uint16_t client_count);
     virtual bool onAuth(String username, String password);
-    virtual bool onData(String topic, const char *data, uint32_t length);
+    virtual void onData(String topic, const char *data, uint32_t length);
 
     virtual bool publish(String topic, uint8_t* data, uint16_t data_length, uint8_t qos=0, uint8_t retain=0);
     virtual bool publish(String topic, String data, uint8_t qos=0, uint8_t retain=0);
diff --git a/src/uMQTTBroker.cpp b/src/uMQTTBroker.cpp
index dfeeda2..e29c15d 100644
--- a/src/uMQTTBroker.cpp
+++ b/src/uMQTTBroker.cpp
@@ -46,7 +46,7 @@ uMQTTBroker *uMQTTBroker::TheBroker;
 	return true;
     }
 
-    bool uMQTTBroker::onData(String topic, const char *data, uint32_t length) {
+    void uMQTTBroker::onData(String topic, const char *data, uint32_t length) {
     }
 
     bool uMQTTBroker::publish(String topic, uint8_t* data, uint16_t data_length, uint8_t qos, uint8_t retain) {
diff --git a/src/uMQTTBroker.h b/src/uMQTTBroker.h
index fde40c2..909e616 100644
--- a/src/uMQTTBroker.h
+++ b/src/uMQTTBroker.h
@@ -59,7 +59,7 @@ public:
 
     virtual bool onConnect(IPAddress addr, uint16_t client_count);
     virtual bool onAuth(String username, String password);
-    virtual bool onData(String topic, const char *data, uint32_t length);
+    virtual void onData(String topic, const char *data, uint32_t length);
 
     virtual bool publish(String topic, uint8_t* data, uint16_t data_length, uint8_t qos=0, uint8_t retain=0);
     virtual bool publish(String topic, String data, uint8_t qos=0, uint8_t retain=0);