diff --git a/lldb/source/Interpreter/CommandInterpreter.cpp b/lldb/source/Interpreter/CommandInterpreter.cpp
--- a/lldb/source/Interpreter/CommandInterpreter.cpp
+++ b/lldb/source/Interpreter/CommandInterpreter.cpp
@@ -2997,6 +2997,7 @@
   if (size > 0) {
     stream.Printf("\n... Interrupted.\n");
   }
+  stream.Flush();
 }
 
 bool CommandInterpreter::EchoCommandNonInteractive(