diff --git a/lldb/include/lldb/API/SBStringList.h b/lldb/include/lldb/API/SBStringList.h
index 29d266f97458..24be39cd1203 100644
--- a/lldb/include/lldb/API/SBStringList.h
+++ b/lldb/include/lldb/API/SBStringList.h
@@ -36,7 +36,7 @@ public:
     AppendList (const char **strv, int strc);
 
     void
-    AppendList (lldb::SBStringList strings);
+    AppendList (const lldb::SBStringList &strings);
 
     uint32_t
     GetSize () const;
@@ -47,8 +47,6 @@ public:
     void
     Clear ();
 
-protected:
-
 #ifndef SWIG
 
     const lldb_private::StringList *
diff --git a/lldb/source/API/SBStringList.cpp b/lldb/source/API/SBStringList.cpp
index f15200061f62..beb760632faf 100644
--- a/lldb/source/API/SBStringList.cpp
+++ b/lldb/source/API/SBStringList.cpp
@@ -94,7 +94,7 @@ SBStringList::AppendList (const char **strv, int strc)
 }
 
 void
-SBStringList::AppendList (SBStringList strings)
+SBStringList::AppendList (const SBStringList &strings)
 {
     if (strings.IsValid())
     {