diff --git a/hardware/arduino/avr/cores/arduino/Stream.cpp b/hardware/arduino/avr/cores/arduino/Stream.cpp
index 39873aac8..9c581bee1 100644
--- a/hardware/arduino/avr/cores/arduino/Stream.cpp
+++ b/hardware/arduino/avr/cores/arduino/Stream.cpp
@@ -75,7 +75,7 @@ void Stream::setTimeout(unsigned long timeout)  // sets the maximum number of mi
  // find returns true if the target string is found
 bool  Stream::find(char *target)
 {
-  return findUntil(target, "");
+  return findUntil(target, (char*)"");
 }
 
 // reads data from the stream until the target string of given length is found
diff --git a/hardware/arduino/sam/cores/arduino/Stream.cpp b/hardware/arduino/sam/cores/arduino/Stream.cpp
index 39873aac8..9c581bee1 100644
--- a/hardware/arduino/sam/cores/arduino/Stream.cpp
+++ b/hardware/arduino/sam/cores/arduino/Stream.cpp
@@ -75,7 +75,7 @@ void Stream::setTimeout(unsigned long timeout)  // sets the maximum number of mi
  // find returns true if the target string is found
 bool  Stream::find(char *target)
 {
-  return findUntil(target, "");
+  return findUntil(target, (char*)"");
 }
 
 // reads data from the stream until the target string of given length is found