diff --git a/beembase/ledgertransactions.py b/beembase/ledgertransactions.py
index fe30ffbc..e6e2a82e 100644
--- a/beembase/ledgertransactions.py
+++ b/beembase/ledgertransactions.py
@@ -53,6 +53,7 @@ def sign(self, path="48'/13'/0'/0'/0'", chain=u"STEEM"):
         apdu_list = self.build_apdu(path, chain)
         for apdu in apdu_list:
             result = dongle.exchange(py23_bytes(apdu))
+        dongle.close()
         sigs = []
         signature = result
         sigs.append(Signature(signature))
@@ -64,6 +65,7 @@ def get_pubkey(self, path="48'/13'/0'/0'/0'", request_screen_approval=False, pre
         dongle = getDongle(True)
         apdu = self.build_apdu_pubkey(path, request_screen_approval)
         result = dongle.exchange(py23_bytes(apdu))
+        dongle.close()
         offset = 1 + result[0]
         address = result[offset + 1: offset + 1 + result[offset]]
         # public_key = result[1: 1 + result[0]]