diff --git a/ext/pgsql/pgsql.c b/ext/pgsql/pgsql.c
index 3f4b606b5106e..2ddbf0af23095 100644
--- a/ext/pgsql/pgsql.c
+++ b/ext/pgsql/pgsql.c
@@ -3429,7 +3429,7 @@ static zend_result pgsql_copy_from_query(PGconn *pgsql, PGresult *pgsql_result,
 	int result;
 	if (ZSTR_LEN(tmp) > 0 && ZSTR_VAL(tmp)[ZSTR_LEN(tmp) - 1] != '\n') {
 		char *zquery = emalloc(ZSTR_LEN(tmp) + 2);
-		memcpy(zquery, ZSTR_VAL(tmp), ZSTR_LEN(tmp) + 1);
+		memcpy(zquery, ZSTR_VAL(tmp), ZSTR_LEN(tmp));
 		zquery[ZSTR_LEN(tmp)] = '\n';
 		zquery[ZSTR_LEN(tmp) + 1] = '\0';
 		result = PQputCopyData(pgsql, zquery, ZSTR_LEN(tmp) + 1);