diff --git a/src/backend/Pg.cpp b/src/backend/Pg.cpp
index 3d374426d..33290d55d 100644
--- a/src/backend/Pg.cpp
+++ b/src/backend/Pg.cpp
@@ -1125,7 +1125,7 @@ $$ LANGUAGE plpgsql;
     //  , R"(Full idempotent text of schema version n)"
 };
 
-static constexpr char* accountTxSchema = R"(
+static constexpr char const* accountTxSchema = R"(
 
 -- account_tx() RPC helper. From the rippled reporting process, only the
 -- parameters without defaults are required. For the parameters with