diff --git a/lib/jasmine-core/jasmine.js b/lib/jasmine-core/jasmine.js
index f752cdb9..bfb4d1b3 100644
--- a/lib/jasmine-core/jasmine.js
+++ b/lib/jasmine-core/jasmine.js
@@ -1542,6 +1542,7 @@ getJasmineRequireObj().Env = function(j$) {
      * @since 2.0.0
      */
     this.topSuite = function() {
+      ensureNonParallel('topSuite');
       return topSuite.metadata;
     };
 
diff --git a/spec/core/EnvSpec.js b/spec/core/EnvSpec.js
index a2d25a9c..1b401f52 100644
--- a/spec/core/EnvSpec.js
+++ b/spec/core/EnvSpec.js
@@ -81,6 +81,19 @@ describe('Env', function() {
       );
       expect(suite.children[1].children[1].children[0].children).toBeFalsy();
     });
+
+    it('throws if called in parallel mode', function() {
+      env.setParallelLoadingState('helpers');
+      check();
+      env.setParallelLoadingState('specs');
+      check();
+
+      function check() {
+        expect(function() {
+          env.topSuite();
+        }).toThrowError("'topSuite' is not available in parallel mode");
+      }
+    });
   });
 
   it('accepts its own current configureation', function() {
diff --git a/src/core/Env.js b/src/core/Env.js
index 6f6a1387..21dd0ef3 100644
--- a/src/core/Env.js
+++ b/src/core/Env.js
@@ -400,6 +400,7 @@ getJasmineRequireObj().Env = function(j$) {
      * @since 2.0.0
      */
     this.topSuite = function() {
+      ensureNonParallel('topSuite');
       return topSuite.metadata;
     };