diff --git a/src/main/webapp/app/components/facetWidgetComponent.js b/src/main/webapp/app/components/facetWidgetComponent.js
index 68a8eb92..2d7e993d 100644
--- a/src/main/webapp/app/components/facetWidgetComponent.js
+++ b/src/main/webapp/app/components/facetWidgetComponent.js
@@ -32,7 +32,7 @@ sage.component("facetWidget", {
     $scope.addFacetFilter = function(facetName) {
       if (!$scope.findFilterByFacet($scope.$ctrl.facet.label, facetName)) {
         $scope.closeMoreFacets();
-        angular.element("#moreFacetsModal-" + $scope.$ctrl.facet.label.split(' ').join('-')).on('hidden.bs.modal', function (e) {
+        angular.element("#moreFacetsModal-" + $filter('simpleAscii')($scope.$ctrl.facet.label)).on('hidden.bs.modal', function (e) {
           $scope.$ctrl.discoveryContext.addFilter($scope.$ctrl.facet.label, $scope.$ctrl.facet.key, facetName).then(function() {
             $scope.$ctrl.resetSearch();
           });
@@ -87,7 +87,7 @@ sage.component("facetWidget", {
       $scope.moreFacets.push(...facets);
       $scope.moreFacetsLabel = $scope.$ctrl.facet.label;
 
-      ModalService.openModal("#moreFacetsModal-" + $scope.$ctrl.facet.label.split(' ').join('-'));
+      ModalService.openModal("#moreFacetsModal-" + $filter('simpleAscii')($scope.$ctrl.facet.label));
     };
 
     $scope.closeMoreFacets = function() {
diff --git a/src/main/webapp/app/filters/simpleAsciiFilter.js b/src/main/webapp/app/filters/simpleAsciiFilter.js
new file mode 100644
index 00000000..f44005b1
--- /dev/null
+++ b/src/main/webapp/app/filters/simpleAsciiFilter.js
@@ -0,0 +1,48 @@
+sage.filter('simpleAscii', function() {
+  return function(text, usedOps) {
+    var sanitized = "";
+    var digit = 0;
+
+    if (angular.isDefined(text) && angular.isString(text)) {
+      for (var i = 0; i < text.length; i++) {
+        digit = text.charCodeAt(i);
+
+        if (digit > 0x2F && digit < 0x3A) {
+          sanitized += text[i];
+        } else if (digit > 0x40 && digit < 0x5B) {
+          sanitized += text[i];
+        } else if (digit > 0x60 && digit < 0x7B) {
+          sanitized += text[i];
+        } else {
+          switch (digit) {
+            case 0x2B:
+            case 0x2D:
+            case 0x2E:
+            case 0x5F:
+            case 0x7E:
+              sanitized += text[i];
+              break;
+
+            default:
+              // Two-byte UTF-8.
+              if ((digit & 0xe0) == 0xc0) {
+                i++;
+              }
+              // Three-byte UTF-8.
+              else if ((digit & 0xf0) == 0xe0) {
+                i += 2;
+              }
+              // Four-byte UTF-8.
+              else if ((digit & 0xf8) == 0xf0) {
+                i += 3;
+              }
+
+              break;
+          }
+        }
+      }
+    }
+
+    return sanitized;
+  };
+});
diff --git a/src/main/webapp/app/views/components/facetWidget.html b/src/main/webapp/app/views/components/facetWidget.html
index 4ab3af58..afc9f241 100644
--- a/src/main/webapp/app/views/components/facetWidget.html
+++ b/src/main/webapp/app/views/components/facetWidget.html
@@ -1,9 +1,9 @@
 <div>
   <span ng-include="'views/components/facetTypes/'+$ctrl.facet.widget.toLowerCase()+'Facet.html'"></span>
   <modal
-    modal-id="moreFacetsModal-{{$ctrl.facet.label.split(' ').join('-')}}"
+    modal-id="moreFacetsModal-{{$ctrl.facet.label | simpleAscii}}"
     modal-view="views/modals/moreFacetsModal.html"
     modal-header-class="modal-header-primary"
     wvr-modal-backdrop="static">
   </modal>
-</div>
\ No newline at end of file
+</div>
diff --git a/src/main/webapp/tests/unit/filters/simpleAsciiFilterTest.js b/src/main/webapp/tests/unit/filters/simpleAsciiFilterTest.js
new file mode 100644
index 00000000..d72cf686
--- /dev/null
+++ b/src/main/webapp/tests/unit/filters/simpleAsciiFilterTest.js
@@ -0,0 +1,98 @@
+describe("filter: simpleAscii", function () {
+  var $scope, MockedUser, filter;
+
+  var initializeVariables = function () {
+    inject(function (_$q_) {
+      $q = _$q_;
+
+      MockedUser = new mockUser($q);
+    });
+  };
+
+  var initializeFilter = function (settings) {
+    inject(function (_$filter_, _$rootScope_) {
+      $scope = _$rootScope_.$new();
+
+      filter = _$filter_("simpleAscii");
+    });
+  };
+
+  beforeEach(function () {
+    module("core");
+    module("sage");
+    module("templates");
+    module("mock.user", function ($provide) {
+      var User = function () {
+        return MockedUser;
+      };
+      $provide.value("User", User);
+    });
+    module("mock.userService");
+
+    installPromiseMatchers();
+    initializeVariables();
+    initializeFilter();
+  });
+
+  afterEach(function () {
+    $scope.$destroy();
+  });
+
+  describe("Is the filter", function () {
+    it("defined", function () {
+      expect(filter).toBeDefined();
+    });
+  });
+
+  describe("Does the filter", function () {
+    it("return nothing on empty input", function () {
+      var result;
+
+      result = filter("");
+
+      expect(result).toBe("");
+    });
+
+    it("all valid characters", function () {
+      var result;
+      var all = "abcdefghijklmnopqrstuvwxyz";
+      all += "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
+      all += "1234567890";
+      all += "+-._~";
+
+      result = filter(all);
+
+      expect(result).toBe(all);
+    });
+
+    it("without whitespace", function () {
+      var result;
+
+      // The character U+200A is between the 'h' and 'i' while U+200D is between the 'i' and 'j'.
+      // These may not normally display in a text editor.
+      var all = "a b  c\fd e f g h i‍j";
+
+      result = filter(all);
+
+      expect(result).toBe("abcdefghij");
+    });
+
+    it("without most symbols", function () {
+      var result;
+      var all = "a`!@#$%^&*()=b{}[];:'\"\\|,<>/?";
+
+      result = filter(all);
+
+      expect(result).toBe("ab");
+    });
+
+    it("skips non-ascii unicode characters", function () {
+      var result;
+      var all = "a↡b𒆷c𔙃d𔑳↡𒆷𔙃e";
+
+      result = filter(all);
+
+      expect(result).toBe("abcde");
+    });
+  });
+});