diff --git a/lldb/include/lldb/API/SBCommandInterpreter.h b/lldb/include/lldb/API/SBCommandInterpreter.h
index 3330a6f20034..b7f5b3bf3396 100644
--- a/lldb/include/lldb/API/SBCommandInterpreter.h
+++ b/lldb/include/lldb/API/SBCommandInterpreter.h
@@ -30,6 +30,7 @@ public:
     eBroadcastBitAsynchronousErrorData = (1 << 4)
   };
 
+  SBCommandInterpreter();
   SBCommandInterpreter(const lldb::SBCommandInterpreter &rhs);
 
   ~SBCommandInterpreter();
@@ -317,9 +318,8 @@ public:
 protected:
   friend class lldb_private::CommandPluginInterfaceImplementation;
 
-  SBCommandInterpreter(
-      lldb_private::CommandInterpreter *interpreter_ptr =
-          nullptr); // Access using SBDebugger::GetCommandInterpreter();
+  /// Access using SBDebugger::GetCommandInterpreter();
+  SBCommandInterpreter(lldb_private::CommandInterpreter *interpreter_ptr);
   lldb_private::CommandInterpreter &ref();
 
   lldb_private::CommandInterpreter *get();
diff --git a/lldb/source/API/SBCommandInterpreter.cpp b/lldb/source/API/SBCommandInterpreter.cpp
index 396c0eef0603..d275da933919 100644
--- a/lldb/source/API/SBCommandInterpreter.cpp
+++ b/lldb/source/API/SBCommandInterpreter.cpp
@@ -83,6 +83,10 @@ protected:
 };
 } // namespace lldb_private
 
+SBCommandInterpreter::SBCommandInterpreter() : m_opaque_ptr() {
+  LLDB_INSTRUMENT_VA(this);
+}
+
 SBCommandInterpreter::SBCommandInterpreter(CommandInterpreter *interpreter)
     : m_opaque_ptr(interpreter) {
   LLDB_INSTRUMENT_VA(this, interpreter);