diff --git a/pySim/utils.py b/pySim/utils.py
index 65f10c5..a68af0a 100644
--- a/pySim/utils.py
+++ b/pySim/utils.py
@@ -98,7 +98,7 @@
 
 def enc_plmn(mcc, mnc):
 	"""Converts integer MCC/MNC into 3 bytes for EF"""
-	return swap_nibbles(lpad('%d' % mcc, 3) + lpad('%d' % mnc, 3))
+	return swap_nibbles(lpad('%d' % int(mcc), 3) + lpad('%d' % int(mnc), 3))
 
 def dec_spn(ef):
 	byte1 = int(ef[0:2])