diff --git a/FU.pm b/FU.pm
index 78c0fce..a0cd38e 100644
--- a/FU.pm
+++ b/FU.pm
@@ -288,7 +288,7 @@ sub _read_req($c) {
 
     # The HTTP reader above and the FastCGI XS reader operate on bytes.
     # Decode these into Unicode strings and check for special characters.
-    eval { FU::Util::utf8_decode($_); 1} || fu->err(400, $@)
+    eval { FU::Util::utf8_decode($_); 1} || fu->error(400, $@)
         for ($REQ->{path}, $REQ->{qs}, values $REQ->{hdr}->%*);
 
     ($REQ->{path}, my $qs) = split /\?/, $REQ->{path}//'', 2;