diff --git a/lldb/source/Interpreter/ScriptInterpreter.cpp b/lldb/source/Interpreter/ScriptInterpreter.cpp
index 208630dfbdb12..00c460612ac19 100644
--- a/lldb/source/Interpreter/ScriptInterpreter.cpp
+++ b/lldb/source/Interpreter/ScriptInterpreter.cpp
@@ -61,6 +61,7 @@ std::string ScriptInterpreter::LanguageToString(lldb::ScriptLanguage language) {
   case eScriptLanguageUnknown:
     return "Unknown";
   }
+  llvm_unreachable("Unhandled ScriptInterpreter!");
 }
 
 lldb::ScriptLanguage