diff --git a/lldb/source/Commands/CommandObjectThread.cpp b/lldb/source/Commands/CommandObjectThread.cpp
index 53b5b7a..44ed39c 100644
--- a/lldb/source/Commands/CommandObjectThread.cpp
+++ b/lldb/source/Commands/CommandObjectThread.cpp
@@ -1729,7 +1729,7 @@
 
       switch (short_option) {
       case 'f':
-        m_filenames.AppendIfUnique(FileSpec(option_arg, false));
+        m_filenames.AppendIfUnique(FileSpec(option_arg));
         if (m_filenames.GetSize() > 1)
           return Status("only one source file expected.");
         break;