--- a/browser/components/enterprisepolicies/Policies.jsm
+++ b/browser/components/enterprisepolicies/Policies.jsm
@@ -732,16 +732,17 @@ var Policies = {
               let newEngineParameters = {
                 template:    newEngine.URLTemplate,
                 iconURL:     newEngine.IconURL ? newEngine.IconURL.href : null,
                 alias:       newEngine.Alias,
                 description: newEngine.Description,
                 method:      newEngine.Method,
                 suggestURL:  newEngine.SuggestURLTemplate,
                 extensionID: "set-via-policy",
+                queryCharset: "UTF-8",
               };
               try {
                 Services.search.addEngineWithDetails(newEngine.Name,
                                                      newEngineParameters);
               } catch (ex) {
                 log.error("Unable to add search engine", ex);
               }
             }