diff --git a/FU.pm b/FU.pm
index ffdc9bd..423c6e1 100644
--- a/FU.pm
+++ b/FU.pm
@@ -689,7 +689,7 @@ sub cookie {
 
 sub json {
     shift;
-    fu->error(400, "Invalid content type for json") if (fu->header('content-type')||'') ne 'application/json';
+    fu->error(400, "Invalid content type for json") if (fu->header('content-type')||'') !~ m{^application/json(?:;\s*charset=utf-?8)?$}i;
     return FU::Util::utf8_decode(my $x = $FU::REQ->{body}) if !@_;
     $FU::REQ->{json} ||= eval {
         FU::Util::json_parse($FU::REQ->{body}, utf8 => 1)