diff --git a/src/modal/modal.js b/src/modal/modal.js
index 68a458eb9f..b1f339dd84 100644
--- a/src/modal/modal.js
+++ b/src/modal/modal.js
@@ -54,6 +54,61 @@ angular.module('ui.bootstrap.modal', [])
     };
   })
 
+/**
+ * A helper, internal data structure that stores all references attached to key
+ */
+  .factory('$$multiMap', function() {
+    return {
+      createNew: function() {
+        var map = {};
+
+        return {
+          entries: function() {
+            return Object.keys(map).map(function(key) {
+              return {
+                key: key,
+                value: map[key]
+              };
+            });
+          },
+          get: function(key) {
+            return map[key];
+          },
+          hasKey: function(key) {
+            return !!map[key];
+          },
+          keys: function() {
+            return Object.keys(map);
+          },
+          put: function(key, value) {
+            if (!map[key]) {
+              map[key] = [];
+            }
+
+            map[key].push(value);
+          },
+          remove: function(key, value) {
+            var values = map[key];
+
+            if (!values) {
+              return;
+            }
+
+            var idx = values.indexOf(value);
+
+            if (idx !== -1) {
+              values.splice(idx, 1);
+            }
+
+            if (!values.length) {
+              delete map[key];
+            }
+          }
+        };
+      }
+    };
+  })
+
 /**
  * A helper directive for the $modal service. It creates a backdrop element.
  */
@@ -220,10 +275,12 @@ angular.module('ui.bootstrap.modal', [])
              '$animate', '$timeout', '$document', '$compile', '$rootScope',
              '$q',
              '$injector',
+             '$$multiMap',
              '$$stackedMap',
     function($animate ,  $timeout ,  $document ,  $compile ,  $rootScope ,
               $q,
               $injector,
+              $$multiMap,
               $$stackedMap) {
       var $animateCss = null;
 
@@ -235,6 +292,7 @@ angular.module('ui.bootstrap.modal', [])
 
       var backdropDomEl, backdropScope;
       var openedWindows = $$stackedMap.createNew();
+      var openedClasses = $$multiMap.createNew();
       var $modalStack = {
         NOW_CLOSING_EVENT: 'modal.stack.now-closing'
       };
@@ -264,7 +322,6 @@ angular.module('ui.bootstrap.modal', [])
       });
 
       function removeModalWindow(modalInstance, elementToReceiveFocus) {
-
         var body = $document.find('body').eq(0);
         var modalWindow = openedWindows.get(modalInstance).value;
 
@@ -272,7 +329,9 @@ angular.module('ui.bootstrap.modal', [])
         openedWindows.remove(modalInstance);
 
         removeAfterAnimate(modalWindow.modalDomEl, modalWindow.modalScope, function() {
-          body.toggleClass(modalWindow.openedClass || OPENED_MODAL_CLASS, openedWindows.length() > 0);
+          var modalBodyClass = modalWindow.openedClass || OPENED_MODAL_CLASS;
+          openedClasses.remove(modalBodyClass, modalInstance);
+          body.toggleClass(modalBodyClass, openedClasses.hasKey(modalBodyClass));
         });
         checkRemoveBackdrop();
 
@@ -377,7 +436,8 @@ angular.module('ui.bootstrap.modal', [])
       });
 
       $modalStack.open = function(modalInstance, modal) {
-        var modalOpener = $document[0].activeElement;
+        var modalOpener = $document[0].activeElement,
+          modalBodyClass = modal.openedClass || OPENED_MODAL_CLASS;
 
         openedWindows.add(modalInstance, {
           deferred: modal.deferred,
@@ -388,6 +448,8 @@ angular.module('ui.bootstrap.modal', [])
           openedClass: modal.openedClass
         });
 
+        openedClasses.put(modalBodyClass, modalInstance);
+
         var body = $document.find('body').eq(0),
             currBackdropIndex = backdropIndex();
 
@@ -419,7 +481,8 @@ angular.module('ui.bootstrap.modal', [])
         openedWindows.top().value.modalDomEl = modalDomEl;
         openedWindows.top().value.modalOpener = modalOpener;
         body.append(modalDomEl);
-        body.addClass(modal.openedClass || OPENED_MODAL_CLASS);
+        body.addClass(modalBodyClass);
+
         $modalStack.clearFocusListCache();
       };
 
diff --git a/src/modal/test/modal.spec.js b/src/modal/test/modal.spec.js
index 456848b5fa..bbd02d62ec 100644
--- a/src/modal/test/modal.spec.js
+++ b/src/modal/test/modal.spec.js
@@ -798,6 +798,52 @@ describe('$modal', function () {
 
         expect(body).not.toHaveClass('foo');
       });
+
+      it('should add multiple custom classes to the body element and remove appropriately', function() {
+        var modal1 = open({
+          template: '<div>dummy modal</div>',
+          openedClass: 'foo'
+        });
+
+        expect(body).toHaveClass('foo');
+        expect(body).not.toHaveClass('modal-open');
+
+        var modal2 = open({
+          template: '<div>dummy modal</div>',
+          openedClass: 'bar'
+        });
+
+        expect(body).toHaveClass('foo');
+        expect(body).toHaveClass('bar');
+        expect(body).not.toHaveClass('modal-open');
+
+        var modal3 = open({
+          template: '<div>dummy modal</div>',
+          openedClass: 'foo'
+        });
+
+        expect(body).toHaveClass('foo');
+        expect(body).toHaveClass('bar');
+        expect(body).not.toHaveClass('modal-open');
+
+        close(modal1);
+
+        expect(body).toHaveClass('foo');
+        expect(body).toHaveClass('bar');
+        expect(body).not.toHaveClass('modal-open');
+
+        close(modal2);
+
+        expect(body).toHaveClass('foo');
+        expect(body).not.toHaveClass('bar');
+        expect(body).not.toHaveClass('modal-open');
+
+        close(modal3);
+
+        expect(body).not.toHaveClass('foo');
+        expect(body).not.toHaveClass('bar');
+        expect(body).not.toHaveClass('modal-open');
+      });
     });
   });
 
diff --git a/src/modal/test/multiMap.spec.js b/src/modal/test/multiMap.spec.js
new file mode 100644
index 0000000000..c89624e914
--- /dev/null
+++ b/src/modal/test/multiMap.spec.js
@@ -0,0 +1,58 @@
+describe('multi map', function() {
+  var multiMap;
+
+  beforeEach(module('ui.bootstrap.modal'));
+  beforeEach(inject(function($$multiMap) {
+    multiMap = $$multiMap.createNew();
+  }));
+
+  it('should add and remove objects by key', function() {
+    multiMap.put('foo', 'bar');
+
+    expect(multiMap.get('foo')).toEqual(['bar']);
+
+    multiMap.put('foo', 'baz');
+
+    expect(multiMap.get('foo')).toEqual(['bar', 'baz']);
+
+    multiMap.remove('foo', 'bar');
+
+    expect(multiMap.get('foo')).toEqual(['baz']);
+
+    multiMap.remove('foo', 'baz');
+
+    expect(multiMap.hasKey('foo')).toBe(false);
+  });
+
+  it('should support getting the keys', function() {
+    multiMap.put('foo', 'bar');
+    multiMap.put('baz', 'boo');
+
+    expect(multiMap.keys()).toEqual(['foo', 'baz']);
+  });
+
+  it('should return all entries', function() {
+    multiMap.put('foo', 'bar');
+    multiMap.put('foo', 'bar2');
+    multiMap.put('baz', 'boo');
+
+    expect(multiMap.entries()).toEqual([
+      {
+        key: 'foo',
+        value: ['bar', 'bar2']
+      },
+      {
+        key: 'baz',
+        value: ['boo']
+      }
+    ]);
+  });
+
+  it('should preserve semantic of an empty key', function() {
+    expect(multiMap.get('key')).toBeUndefined();
+  });
+
+  it('should respect removal of non-existing elements', function() {
+    expect(multiMap.remove('foo', 'bar')).toBeUndefined();
+  });
+});