diff --git a/pySim/legacy/cards.py b/pySim/legacy/cards.py
index 9efa66b8..3b66328b 100644
--- a/pySim/legacy/cards.py
+++ b/pySim/legacy/cards.py
@@ -152,7 +152,8 @@ class SimCard(SimCardBase):
         return sw
 
     def update_smsp(self, smsp):
-        data, sw = self._scc.update_record(EF['SMSP'], 1, rpad(smsp, 84))
+        print("using update_smsp")
+        data, sw = self._scc.update_record(EF['SMSP'], 1, smsp, leftpad=True)
         return sw
 
     def update_ad(self, mnc=None, opmode=None, ofm=None, path=EF['AD']):
diff --git a/tests/pySim-prog_test/Fairwaves-SIM.ok b/tests/pySim-prog_test/Fairwaves-SIM.ok
index 42e92e8e..5210d012 100644
--- a/tests/pySim-prog_test/Fairwaves-SIM.ok
+++ b/tests/pySim-prog_test/Fairwaves-SIM.ok
@@ -5,7 +5,7 @@ ICCID: 8988219000000117833
 IMSI: 001010000000111
 GID1: ffffffffffffffff
 GID2: ffffffffffffffff
-SMSP: e1ffffffffffffffffffffffff0581005155f5ffffffffffff000000ffffffffffffffffffffffffffff
+SMSP: ffffffffffffffffffffffffffffe1ffffffffffffffffffffffff0581005155f5ffffffffffff000000
 SMSC: 0015555
 SPN: Fairwaves
 Show in HPLMN: False
diff --git a/tests/pySim-prog_test/Wavemobile-SIM.ok b/tests/pySim-prog_test/Wavemobile-SIM.ok
index 86f4830e..3d9e9b38 100644
--- a/tests/pySim-prog_test/Wavemobile-SIM.ok
+++ b/tests/pySim-prog_test/Wavemobile-SIM.ok
@@ -5,7 +5,7 @@ ICCID: 89445310150011013678
 IMSI: 001010000000102
 GID1: Can't read file -- SW match failed! Expected 9000 and got 6a82.
 GID2: Can't read file -- SW match failed! Expected 9000 and got 6a82.
-SMSP: e1ffffffffffffffffffffffff0581005155f5ffffffffffff000000ffffffffffffffffffffffffffff
+SMSP: ffffffffffffffffffffffffffffe1ffffffffffffffffffffffff0581005155f5ffffffffffff000000
 SMSC: 0015555
 SPN: wavemobile
 Show in HPLMN: False