diff --git a/libraries/Servo/src/Servo.h b/libraries/Servo/src/Servo.h
index b55fdb8f2..d4bf861ba 100644
--- a/libraries/Servo/src/Servo.h
+++ b/libraries/Servo/src/Servo.h
@@ -77,7 +77,7 @@ class Servo
 public:
     Servo();
     uint8_t attach(int pin);           // attach the given pin to the next free channel, sets pinMode, returns channel number or 0 if failure
-    uint8_t attach(int pin, int min, int max); // as above but also sets min and max values for writes. 
+    uint8_t attach(int pin, uint16_t min, uint16_t max); // as above but also sets min and max values for writes. 
     void detach();
     void write(int value);             // if value is < 200 its treated as an angle, otherwise as pulse width in microseconds 
     void writeMicroseconds(int value); // Write pulse width in microseconds 
diff --git a/libraries/Servo/src/esp8266/Servo.cpp b/libraries/Servo/src/esp8266/Servo.cpp
index ef73f94d2..dd15168cb 100644
--- a/libraries/Servo/src/esp8266/Servo.cpp
+++ b/libraries/Servo/src/esp8266/Servo.cpp
@@ -221,7 +221,7 @@ uint8_t Servo::attach(int pin)
     return attach(pin, MIN_PULSE_WIDTH, MAX_PULSE_WIDTH);
 }
 
-uint8_t Servo::attach(int pin, int minUs, int maxUs)
+uint8_t Servo::attach(int pin, uint16_t minUs, uint16_t maxUs)
 {
     ServoTimerSequence timerId;
 
@@ -235,8 +235,8 @@ uint8_t Servo::attach(int pin, int minUs, int maxUs)
         // keep the min and max within 200-3000 us, these are extreme
         // ranges and should support extreme servos while maintaining
         // reasonable ranges
-        _maxUs = max(250, min(3000, maxUs));
-        _minUs = max(200, min(_maxUs, minUs));
+        _maxUs = max((uint16_t)250, min((uint16_t)3000, maxUs));
+        _minUs = max((uint16_t)200, min(_maxUs, minUs));
 
         // initialize the timerId if it has not already been initialized
         timerId = SERVO_INDEX_TO_TIMER(_servoIndex);