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--- a/src/rcldb/rcldb.cpp
+++ b/src/rcldb/rcldb.cpp
@@ -762,6 +762,10 @@
     }
     if (!m_config->getStopfile().empty())
 	m_stops.setFile(m_config->getStopfile());
+    // Synonyms are only used at query time for now
+    if (mode == DbRO)
+	m_syngroups.setfile(m_config->getSynGroupsFile());
+
     string dir = m_config->getDbDir();
     string ermsg;
     try {