diff --git a/src/PVE/ACME.pm b/src/PVE/ACME.pm
index bf5410d..65094c2 100644
--- a/src/PVE/ACME.pm
+++ b/src/PVE/ACME.pm
@@ -7,7 +7,7 @@ use POSIX;
 
 use Data::Dumper;
 use Date::Parse;
-use MIME::Base64 qw(encode_base64url decode_base64);
+use MIME::Base64 qw(encode_base64url decode_base64 decode_base64url);
 use File::Path qw(make_path);
 use JSON;
 use Digest::SHA qw(sha256 sha256_hex hmac_sha256);
@@ -365,7 +365,12 @@ sub new_account {
     my %payload = ( contact => $info{contact} );
 
     if (defined($info{eab})) {
-	my $eab_hmac_key = decode_base64($info{eab}->{hmac_key});
+	my $eab_hmac_key;
+	if ($info{eab}->{hmac_key} =~ m/[+\/]/) {
+	    $eab_hmac_key = decode_base64($info{eab}->{hmac_key});
+	} else {
+	    $eab_hmac_key = decode_base64url($info{eab}->{hmac_key});
+	}
 	$payload{externalAccountBinding} = external_account_binding_jws(
 	    $info{eab}->{kid},
 	    $eab_hmac_key,