diff --git a/src/HashedObject.cpp b/src/HashedObject.cpp
index 36f4273bc2..4305a5b5cb 100644
--- a/src/HashedObject.cpp
+++ b/src/HashedObject.cpp
@@ -52,8 +52,9 @@ void HashedObjectStore::bulkWrite()
 	}
 	Log(lsINFO) << "HOS: BulkWrite " << set.size();
 
-	boost::format fExists("SELECT ObjType FROM CommittedObjects WHERE Hash = '%s';");
-	boost::format fAdd("INSERT INTO CommittedObjects (Hash,ObjType,LedgerIndex,Object) VALUES ('%s','%c','%u',%s);");
+	static boost::format fExists("SELECT ObjType FROM CommittedObjects WHERE Hash = '%s';");
+	static boost::format
+		fAdd("INSERT INTO CommittedObjects (Hash,ObjType,LedgerIndex,Object) VALUES ('%s','%c','%u',%s);");
 
 	Database* db = theApp->getHashNodeDB()->getDB();
 	ScopedLock sl = theApp->getHashNodeDB()->getDBLock();