diff --git a/indra/llcommon/llstring.h b/indra/llcommon/llstring.h
index d3f1d01aa20d0876eb0bb03d754be1c3b2adaec4..4c3936f9abe38a835c6d4da4c245de10f246af0e 100644
--- a/indra/llcommon/llstring.h
+++ b/indra/llcommon/llstring.h
@@ -307,7 +307,7 @@ class LLStringUtilBase
 	 * quote it, escape any embedded double-quote with the escape string (default
 	 * backslash).
 	 */
-	string_type quote(const string_type& str, const string_type& escape="\\");
+	static string_type quote(const string_type& str, const string_type& escape="\\");
 
 	/**
 	 * @brief Unsafe way to make ascii characters. You should probably