diff --git a/frontend/static/js/challenge.js b/frontend/static/js/challenge.js
index 8c2b7bb3..7a670ddb 100644
--- a/frontend/static/js/challenge.js
+++ b/frontend/static/js/challenge.js
@@ -111,7 +111,7 @@ angular.module("FICApp", ["ngRoute", "ngSanitize"])
 		    this[key].gain = 0;
 		    this[key].solved = 0;
 		    angular.forEach(theme.exercices, function(ex, k) {
-			$scope.exercicesUrl[ex.urlid] = k;
+			$scope.exercicesUrl[theme.urlid + "/" + ex.urlid] = k;
 			this.gain += ex.gain;
 			this.solved += ex.solved;
 			this.exercice_coeff_max = Math.max(this.exercice_coeff_max, ex.curcoeff);
@@ -234,7 +234,7 @@ angular.module("FICApp", ["ngRoute", "ngSanitize"])
 	if ($routeParams.exercice) {
 	    $scope.$watch("exercicesUrl", function(exercicesUrl) {
 		if (exercicesUrl != undefined)
-		    $rootScope.current_exercice = exercicesUrl[$routeParams.exercice];
+		    $rootScope.current_exercice = exercicesUrl[$routeParams.theme + "/" + $routeParams.exercice];
 	    })
 	} else {
 	    $rootScope.current_exercice = 0;