diff --git a/cores/arduino/USB/CDC.cpp b/cores/arduino/USB/CDC.cpp
index dea6bd2b..e76c864e 100644
--- a/cores/arduino/USB/CDC.cpp
+++ b/cores/arduino/USB/CDC.cpp
@@ -311,7 +311,6 @@ Serial_::operator bool()
 		result = true;
 	}
 
-	delay(10);
 	return result;
 }