diff --git a/t/match_info.t b/t/match_info.t
index 235ae66..4e20fb5 100644
--- a/t/match_info.t
+++ b/t/match_info.t
@@ -27,6 +27,7 @@
 # Query passed
 $t->get_ok('/corpus/WPD15/232/39681/p2133-2134?spans=false&foundry=*&format=json')
   ->status_is(200)
+  ->content_type_is('application/json;charset=UTF-8')
   ->json_is('/textSigle', 'WPD15/232/39681')
   ->json_like('/snippet', qr!<span class=\"context-left\">!)
   ->header_isnt('X-Kalamar-Cache', 'true')
@@ -101,6 +102,14 @@
   ;
 
 $t->get_ok('/corpus/WPD15/232/39681/p2133-2134?spans=no&format=html')
+  ->content_type_is('text/html;charset=UTF-8')
+  ->status_is(400)
+  ->text_is('p.no-results', 'Unable to perform the action.')
+  ->text_is('div.notify', 'Parameter "spans" invalid')
+  ;
+
+$t->get_ok('/corpus/WPD15/232/39681/p2133-2134?spans=no')
+  ->content_type_is('text/html;charset=UTF-8')
   ->status_is(400)
   ->text_is('p.no-results', 'Unable to perform the action.')
   ->text_is('div.notify', 'Parameter "spans" invalid')
diff --git a/t/query.t b/t/query.t
index 227dbf1..d3f0cd3 100644
--- a/t/query.t
+++ b/t/query.t
@@ -31,6 +31,7 @@
 $t->get_ok('/?q=baum')
   ->status_is(200)
   ->text_is('#error','')
+  ->content_type_is('text/html;charset=UTF-8')
 
   ->text_is('title', 'KorAP: Find »baum« with Poliqarp')
   ->element_exists('meta[name="DC.title"][content="KorAP: Find »baum« with Poliqarp"]')