diff --git a/mobile/ios/Classes/OTPAuthURL.m b/mobile/ios/Classes/OTPAuthURL.m
index ec93b63..e9d93ba 100644
--- a/mobile/ios/Classes/OTPAuthURL.m
+++ b/mobile/ios/Classes/OTPAuthURL.m
@@ -186,6 +186,8 @@ + (NSData *)base32Decode:(NSString *)string {
     [GTMStringEncoding stringEncodingWithString:kBase32Charset];
   [coder addDecodeSynonyms:kBase32Synonyms];
   [coder ignoreCharacters:kBase32Sep];
+  [coder setPaddingChar:'=']
+  [coder setDoPad:YES];
   return [coder decode:string];
 }
 
@@ -194,6 +196,8 @@ + (NSString *)encodeBase32:(NSData *)data {
     [GTMStringEncoding stringEncodingWithString:kBase32Charset];
   [coder addDecodeSynonyms:kBase32Synonyms];
   [coder ignoreCharacters:kBase32Sep];
+  [coder setPaddingChar:'=']
+  [coder setDoPad:YES];
   return [coder encode:data];
 }