diff --git a/lib/Debugger/SourceLanguage-Unknown.cpp b/lib/Debugger/SourceLanguage-Unknown.cpp
index 514afa3..b806fc7 100644
--- a/lib/Debugger/SourceLanguage-Unknown.cpp
+++ b/lib/Debugger/SourceLanguage-Unknown.cpp
@@ -59,7 +59,7 @@
 //
 
 namespace {
-  struct SLU : public SourceLanguage {
+  static struct SLU : public SourceLanguage {
     //===------------------------------------------------------------------===//
     // Implement the miscellaneous methods...
     //