diff --git a/xmlhelp/source/cxxhelp/provider/urlparameter.cxx b/xmlhelp/source/cxxhelp/provider/urlparameter.cxx
index d1819e91e44c..8d9cd65c06b0 100644
--- a/xmlhelp/source/cxxhelp/provider/urlparameter.cxx
+++ b/xmlhelp/source/cxxhelp/provider/urlparameter.cxx
@@ -575,7 +575,7 @@ struct UserData {
     URLParameter*                       m_pInitial;
 };
 
-UserData *ugblData = nullptr;
+static UserData *ugblData = nullptr;
 
 extern "C" {