diff --git a/src/utils/configuration.cpp b/src/utils/configuration.cpp
index dd629f7..3b3cc77 100644
--- a/src/utils/configuration.cpp
+++ b/src/utils/configuration.cpp
@@ -119,6 +119,7 @@ void ConfigurationMap::addKeys(keys_t& names) const
         names.insert(it->first);
 }
 
+static
 const ENV_PARAM * findEnvConfigParam( const char * envVarName )
 {
     const ENV_PARAM **ppParam = env_param_list;