diff --git a/searx/engines/wallhaven.py b/searx/engines/wallhaven.py
index 127873d5d..4ab83a562 100644
--- a/searx/engines/wallhaven.py
+++ b/searx/engines/wallhaven.py
@@ -57,7 +57,7 @@ def request(query, params):
     }
 
     if api_key:
-        params['api_key'] = api_key
+        params['headers']['X-API-Key'] = api_key
 
     params['url'] = f"{base_url}/api/v1/search?{urlencode(args)}"
     return params