diff --git a/cores/esp8266/FunctionalInterrupt.h b/cores/esp8266/FunctionalInterrupt.h
index 968793e49..29f49542c 100644
--- a/cores/esp8266/FunctionalInterrupt.h
+++ b/cores/esp8266/FunctionalInterrupt.h
@@ -28,8 +28,8 @@ struct ArgStructure {
 	FunctionInfo* functionInfo = nullptr;
 };
 
-void attachInterrupt(uint8_t pin, std::function<void(void)> intRoutine, int mode);
-void attachScheduledInterrupt(uint8_t pin, std::function<void(InterruptInfo)> scheduledIntRoutine, int mode);
+bool attachInterrupt(uint8_t pin, std::function<void(void)> intRoutine, int mode);
+bool attachScheduledInterrupt(uint8_t pin, std::function<void(InterruptInfo)> scheduledIntRoutine, int mode);
 
 
 #endif //INTERRUPTS_H
diff --git a/cores/esp8266/cbuf.cpp b/cores/esp8266/cbuf.cpp
index 5f394f9df..b9a2880e3 100644
--- a/cores/esp8266/cbuf.cpp
+++ b/cores/esp8266/cbuf.cpp
@@ -18,6 +18,7 @@
  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  */
 
+#include <new> // std::nothrow
 #include "cbuf.h"
 #include "c_types.h"
 
diff --git a/libraries/ArduinoOTA/ArduinoOTA.cpp b/libraries/ArduinoOTA/ArduinoOTA.cpp
index 2a7bd235f..30f9c413e 100644
--- a/libraries/ArduinoOTA/ArduinoOTA.cpp
+++ b/libraries/ArduinoOTA/ArduinoOTA.cpp
@@ -108,7 +108,7 @@ void ArduinoOTAClass::setRebootOnSuccess(bool reboot){
 
 bool ArduinoOTAClass::begin(bool useMDNS) {
   if (_initialized)
-    return;
+    return true;
 
   _useMDNS = useMDNS;
 
diff --git a/libraries/ArduinoOTA/ArduinoOTA.h b/libraries/ArduinoOTA/ArduinoOTA.h
index 1dfcaeed3..5a84fed23 100644
--- a/libraries/ArduinoOTA/ArduinoOTA.h
+++ b/libraries/ArduinoOTA/ArduinoOTA.h
@@ -60,7 +60,7 @@ class ArduinoOTAClass
     void onProgress(THandlerFunction_Progress fn);
 
     //Starts the ArduinoOTA service
-    void begin(bool useMDNS = true);
+    bool begin(bool useMDNS = true);
 
     //Call this in loop() to run the service. Also calls MDNS.update() when begin() or begin(true) is used.
     void handle();