diff --git a/opac/svc/club/cancel_enrollment b/opac/svc/club/cancel_enrollment
index 0b9fb5aa44..e4f5dc5bf1 100755
--- a/opac/svc/club/cancel_enrollment
+++ b/opac/svc/club/cancel_enrollment
@@ -42,6 +42,6 @@ my $enrollment = Koha::Club::Enrollments->find($id);
 $enrollment->cancel();
 
 binmode STDOUT, ':encoding(UTF-8)';
-print $cgi->header( -type => 'text/plain', -charset => 'UTF-8' );
+print $cgi->header( -type => 'application/json', -charset => 'UTF-8' );
 
 print to_json( { success => $enrollment ? 1 : 0 } );
diff --git a/opac/svc/club/enroll b/opac/svc/club/enroll
index ed19fc89b0..97449e6a85 100755
--- a/opac/svc/club/enroll
+++ b/opac/svc/club/enroll
@@ -72,6 +72,6 @@ if ( $borrowernumber && $id ) {
 }
 
 binmode STDOUT, ':encoding(UTF-8)';
-print $cgi->header( -type => 'text/plain', -charset => 'UTF-8' );
+print $cgi->header( -type => 'application/json', -charset => 'UTF-8' );
 
 print to_json( { success => $enrollment ? 1 : 0 } );