diff --git a/libraries/tests/mbed/echo/main.cpp b/libraries/tests/mbed/echo/main.cpp
index e514dc72f9..583e9d884d 100644
--- a/libraries/tests/mbed/echo/main.cpp
+++ b/libraries/tests/mbed/echo/main.cpp
@@ -10,13 +10,13 @@
 
 int main() {
     char buf[256];
-    
+
     Serial pc(TXPIN, RXPIN);
     pc.baud(115200);
-    
+
     while (1) {
         pc.gets(buf, 256);
-        
+
         pc.printf("%s", buf);
     }
 }