diff --git a/lib/amd/build/ajax.min.js b/lib/amd/build/ajax.min.js
index c7c80e17e5c..3af51d68cd9 100644
--- a/lib/amd/build/ajax.min.js
+++ b/lib/amd/build/ajax.min.js
@@ -1 +1 @@
-define(["jquery","core/config"],function(a,b){var c=function(a){var b,c,d=this,e=null,f=0;for(f=0;f<d.length;f++){if(b=d[f],c=a[f],"undefined"==typeof c){e=new Error("missing response");break}if(c.error!==!1){e=c.exception;break}b.deferred.resolve(c.data)}if(null!==e)for(;f<d.length;f++)b=d[f],b.deferred.reject(e)},d=function(a,b){var c=this,d=0;for(d=0;d<c.length;d++){var e=c[d];"undefined"!=typeof e.fail&&e.deferred.reject(b)}};return{call:function(e,f,g){var h,i=[],j=[];for("undefined"==typeof g&&(g=!0),"undefined"==typeof f&&(f=!0),h=0;h<e.length;h++){var k=e[h];i.push({index:h,methodname:k.methodname,args:k.args}),k.deferred=a.Deferred(),j.push(k.deferred.promise()),"undefined"!=typeof k.done&&k.deferred.done(k.done),"undefined"!=typeof k.fail&&k.deferred.fail(k.fail),k.index=h}i=JSON.stringify(i);var l={type:"POST",data:i,context:e,dataType:"json",processData:!1,async:f},m=b.wwwroot+"/lib/ajax/service.php?sesskey="+b.sesskey;return g||(m=b.wwwroot+"/lib/ajax/service-nologin.php?sesskey="+b.sesskey),f?a.ajax(m,l).done(c).fail(d):(l.success=c,l.error=d,a.ajax(m,l)),j}}});
\ No newline at end of file
+define(["jquery","core/config"],function(a,b){var c=function(a){var b,c,d=this,e=null,f=0;for(f=0;f<d.length;f++){if(b=d[f],c=a[f],"undefined"==typeof c){e=new Error("missing response");break}if(c.error!==!1){e=c.exception;break}b.deferred.resolve(c.data)}if(null!==e)for(;f<d.length;f++)b=d[f],b.deferred.reject(e)},d=function(a,b){var c=this,d=0;for(d=0;d<c.length;d++){var e=c[d];"undefined"!=typeof e.fail&&e.deferred.reject(b)}};return{call:function(e,f,g){var h,i=[],j=[];for("undefined"==typeof g&&(g=!0),"undefined"==typeof f&&(f=!0),h=0;h<e.length;h++){var k=e[h];i.push({index:h,methodname:k.methodname,args:k.args}),k.deferred=a.Deferred(),j.push(k.deferred.promise()),"undefined"!=typeof k.done&&k.deferred.done(k.done),"undefined"!=typeof k.fail&&k.deferred.fail(k.fail),k.index=h}i=JSON.stringify(i);var l={type:"POST",data:i,context:e,dataType:"json",processData:!1,async:f,contentType:"application/json"},m=b.wwwroot+"/lib/ajax/service.php?sesskey="+b.sesskey;return g||(m=b.wwwroot+"/lib/ajax/service-nologin.php?sesskey="+b.sesskey),f?a.ajax(m,l).done(c).fail(d):(l.success=c,l.error=d,a.ajax(m,l)),j}}});
\ No newline at end of file
diff --git a/lib/amd/src/ajax.js b/lib/amd/src/ajax.js
index 38a393b7ae9..0ba0d5d5f05 100644
--- a/lib/amd/src/ajax.js
+++ b/lib/amd/src/ajax.js
@@ -148,7 +148,8 @@ define(['jquery', 'core/config'], function($, config) {
                 context: requests,
                 dataType: 'json',
                 processData: false,
-                async: async
+                async: async,
+                contentType: "application/json"
             };
 
             var script = config.wwwroot + '/lib/ajax/service.php?sesskey=' + config.sesskey;