diff --git a/api-openbis-javascript/src/v3/openbis.js b/api-openbis-javascript/src/v3/openbis.js
index 23b5e42a8a445034a38063245d6d43a17d87c4af..354ee23ff2b50676f68cc0b1252497d5e4470a74 100644
--- a/api-openbis-javascript/src/v3/openbis.js
+++ b/api-openbis-javascript/src/v3/openbis.js
@@ -11,6 +11,7 @@ define([ 'jquery', 'util/Json', 'as/dto/datastore/search/DataStoreSearchCriteria
 			settings.type = "POST";
 			settings.processData = false;
 			settings.dataType = "json";
+			settings.contentType = "application/json";
 
 			var returnType = settings.returnType;
 			if (returnType) {