diff --git a/corpusparser/main.py b/corpusparser/main.py
index b1277ce..b12478e 100644
--- a/corpusparser/main.py
+++ b/corpusparser/main.py
@@ -90,6 +90,7 @@ def _handle_kres_file_tpl(kres_file_tpl):
         kres_col.insert_many(kres_data_1)  # much much better (just make sure sid has a unique index)
         logger.info("Inserted data from {} ({}/{}) in {:.2f} s".format(
             kres_file, kres_file_idx, n_kres_files, time.time() - tstart))
+        dbclient.close()
 
 def _get_dbclient(args):
     dbclient = MongoClient(
@@ -130,6 +131,7 @@ if __name__ == "__main__":
         dbclient.valdb[corpus].ensure_index([("sid", pymongo.ASCENDING)])
         dbclient.valdb[corpus].ensure_index([("headwords", pymongo.ASCENDING)])
         dbclient.valdb[corpus].ensure_index([("functors", pymongo.ASCENDING)])
+        dbclient.close()
 
 
     if corpus == "ssj":
@@ -147,6 +149,7 @@ if __name__ == "__main__":
             for sentence in ssj_data:
                 sentence = _db_preprocess(sentence)
                 ssj_col.update({"sid": sentence["sid"]}, sentence, upsert=True)
+            dbclient.close()
 
 
     if corpus == "kres":