diff --git a/lib/jasmine-core/jasmine.js b/lib/jasmine-core/jasmine.js
index 85be2107..54508b2f 100644
--- a/lib/jasmine-core/jasmine.js
+++ b/lib/jasmine-core/jasmine.js
@@ -1691,6 +1691,10 @@ getJasmineRequireObj().Env = function(j$) {
      * @see custom_reporter
      */
     this.addReporter = function(reporterToAdd) {
+      if (parallelLoadingState) {
+        throw new Error('Reporters cannot be added via Env in parallel mode');
+      }
+
       reporter.addReporter(reporterToAdd);
     };
 
@@ -1713,6 +1717,10 @@ getJasmineRequireObj().Env = function(j$) {
      * @function
      */
     this.clearReporters = function() {
+      if (parallelLoadingState) {
+        throw new Error('Reporters cannot be removed via Env in parallel mode');
+      }
+
       reporter.clearReporters();
     };
 
diff --git a/spec/core/EnvSpec.js b/spec/core/EnvSpec.js
index 0b650158..8243f452 100644
--- a/spec/core/EnvSpec.js
+++ b/spec/core/EnvSpec.js
@@ -786,4 +786,32 @@ describe('Env', function() {
       ).toBeRejectedWithError(msg);
     });
   });
+
+  describe('#addReporter', function() {
+    it('throws when called in parallel mode', function() {
+      env.setParallelLoadingState('helpers');
+      expect(function() {
+        env.addReporter({});
+      }).toThrowError('Reporters cannot be added via Env in parallel mode');
+
+      env.setParallelLoadingState('specs');
+      expect(function() {
+        env.addReporter({});
+      }).toThrowError('Reporters cannot be added via Env in parallel mode');
+    });
+  });
+
+  describe('#clearReporters', function() {
+    it('throws when called in parallel mode', function() {
+      env.setParallelLoadingState('helpers');
+      expect(function() {
+        env.clearReporters();
+      }).toThrowError('Reporters cannot be removed via Env in parallel mode');
+
+      env.setParallelLoadingState('specs');
+      expect(function() {
+        env.clearReporters();
+      }).toThrowError('Reporters cannot be removed via Env in parallel mode');
+    });
+  });
 });
diff --git a/src/core/Env.js b/src/core/Env.js
index f7721435..a2dd481d 100644
--- a/src/core/Env.js
+++ b/src/core/Env.js
@@ -549,6 +549,10 @@ getJasmineRequireObj().Env = function(j$) {
      * @see custom_reporter
      */
     this.addReporter = function(reporterToAdd) {
+      if (parallelLoadingState) {
+        throw new Error('Reporters cannot be added via Env in parallel mode');
+      }
+
       reporter.addReporter(reporterToAdd);
     };
 
@@ -571,6 +575,10 @@ getJasmineRequireObj().Env = function(j$) {
      * @function
      */
     this.clearReporters = function() {
+      if (parallelLoadingState) {
+        throw new Error('Reporters cannot be removed via Env in parallel mode');
+      }
+
       reporter.clearReporters();
     };