diff --git a/src/core/Env.js b/src/core/Env.js
index b26c7db0..86e86ac4 100644
--- a/src/core/Env.js
+++ b/src/core/Env.js
@@ -384,6 +384,12 @@ getJasmineRequireObj().Env = function(j$) {
       }
     };
 
+    function ensureIsNotNested(method, currentSuite) {
+      if (currentSuite !== undefined) {
+        throw new Error('\'' + method + '\' should only be used in \'describe\' function');
+      }
+    }
+
     var suiteFactory = function(description) {
       var suite = new j$.Suite({
         env: self,
@@ -399,6 +405,7 @@ getJasmineRequireObj().Env = function(j$) {
     };
 
     this.describe = function(description, specDefinitions) {
+      ensureIsNotNested('describe', currentSuite());
       ensureIsFunction(specDefinitions, 'describe');
       var suite = suiteFactory(description);
       if (specDefinitions.length > 0) {
@@ -412,6 +419,7 @@ getJasmineRequireObj().Env = function(j$) {
     };
 
     this.xdescribe = function(description, specDefinitions) {
+      ensureIsNotNested('xdescribe', currentSuite());
       ensureIsFunction(specDefinitions, 'xdescribe');
       var suite = suiteFactory(description);
       suite.pend();
@@ -422,6 +430,7 @@ getJasmineRequireObj().Env = function(j$) {
     var focusedRunnables = [];
 
     this.fdescribe = function(description, specDefinitions) {
+      ensureIsNotNested('fdescribe', currentSuite());
       ensureIsFunction(specDefinitions, 'fdescribe');
       var suite = suiteFactory(description);
       suite.isFocused = true;
@@ -519,6 +528,7 @@ getJasmineRequireObj().Env = function(j$) {
     };
 
     this.it = function(description, fn, timeout) {
+      ensureIsNotNested('it', currentSuite());
       // it() sometimes doesn't have a fn argument, so only check the type if
       // it's given.
       if (arguments.length > 1 && typeof fn !== 'undefined') {
@@ -533,6 +543,7 @@ getJasmineRequireObj().Env = function(j$) {
     };
 
     this.xit = function(description, fn, timeout) {
+      ensureIsNotNested('xit', currentSuite());
       // xit(), like it(), doesn't always have a fn argument, so only check the
       // type when needed.
       if (arguments.length > 1 && typeof fn !== 'undefined') {
@@ -544,6 +555,7 @@ getJasmineRequireObj().Env = function(j$) {
     };
 
     this.fit = function(description, fn, timeout){
+      ensureIsNotNested('fit', currentSuite());
       ensureIsFunctionOrAsync(fn, 'fit');
       var spec = specFactory(description, fn, currentDeclarationSuite, timeout);
       currentDeclarationSuite.addChild(spec);
@@ -561,6 +573,7 @@ getJasmineRequireObj().Env = function(j$) {
     };
 
     this.beforeEach = function(beforeEachFunction, timeout) {
+      ensureIsNotNested('beforeEach', currentSuite());
       ensureIsFunctionOrAsync(beforeEachFunction, 'beforeEach');
       currentDeclarationSuite.beforeEach({
         fn: beforeEachFunction,
@@ -569,6 +582,7 @@ getJasmineRequireObj().Env = function(j$) {
     };
 
     this.beforeAll = function(beforeAllFunction, timeout) {
+      ensureIsNotNested('beforeAll', currentSuite());
       ensureIsFunctionOrAsync(beforeAllFunction, 'beforeAll');
       currentDeclarationSuite.beforeAll({
         fn: beforeAllFunction,
@@ -577,6 +591,7 @@ getJasmineRequireObj().Env = function(j$) {
     };
 
     this.afterEach = function(afterEachFunction, timeout) {
+      ensureIsNotNested('afterEach', currentSuite());
       ensureIsFunctionOrAsync(afterEachFunction, 'afterEach');
       afterEachFunction.isCleanup = true;
       currentDeclarationSuite.afterEach({
@@ -586,6 +601,7 @@ getJasmineRequireObj().Env = function(j$) {
     };
 
     this.afterAll = function(afterAllFunction, timeout) {
+      ensureIsNotNested('afterAll', currentSuite());
       ensureIsFunctionOrAsync(afterAllFunction, 'afterAll');
       currentDeclarationSuite.afterAll({
         fn: afterAllFunction,