diff --git a/lib/command.js b/lib/command.js
index 0bc48ed20..0c78b94b9 100644
--- a/lib/command.js
+++ b/lib/command.js
@@ -1598,6 +1598,14 @@ Expecting one of '${allowedValues.join("', '")}'`);
    * @api private
    */
   _conflictingOption(option, conflictingOption) {
+    const getNegatedOption = (option) => {
+      const optionKey = option.attributeName();
+      const negatedLongFlag = option.long && `--no-${optionKey}`;
+      const negatedOption = negatedLongFlag && this._findOption(negatedLongFlag);
+
+      return negatedOption;
+    };
+
     const getErrorMessage = (option) => {
       const optionKey = option.attributeName();
       const source = this.getOptionValueSource(optionKey);
@@ -1607,7 +1615,10 @@ Expecting one of '${allowedValues.join("', '")}'`);
       return `option '${option.flags}'`;
     };
 
-    const message = `error: ${getErrorMessage(option)} cannot be used with ${getErrorMessage(conflictingOption)}`;
+    const originOption = getNegatedOption(option) || option;
+    const originConflictingOption = getNegatedOption(conflictingOption) || conflictingOption;
+
+    const message = `error: ${getErrorMessage(originOption)} cannot be used with ${getErrorMessage(originConflictingOption)}`;
     this.error(message, { code: 'commander.conflictingOption' });
   }
 
diff --git a/tests/command.conflicts.test.js b/tests/command.conflicts.test.js
index a1e55d103..e6ea10d63 100644
--- a/tests/command.conflicts.test.js
+++ b/tests/command.conflicts.test.js
@@ -24,6 +24,7 @@ describe('command with conflicting options', () => {
   beforeEach(() => {
     delete process.env.SILENT;
     delete process.env.JSON;
+    delete process.env.NO_COLOR;
   });
 
   test('should call action if there are no explicit conflicting options set', () => {
@@ -92,4 +93,34 @@ describe('command with conflicting options', () => {
     expect(actionMock).toHaveBeenCalledTimes(1);
     expect(actionMock).toHaveBeenCalledWith({ debug: true, silent: true }, expect.any(Object));
   });
+
+  test('should report conflict on negated option flag', () => {
+    const { program } = makeProgram();
+
+    program
+      .command('bar')
+      .addOption(new commander.Option('--red').conflicts(['color']))
+      .addOption(new commander.Option('--color'))
+      .addOption(new commander.Option('-N, --no-color'));
+
+    expect(() => {
+      program.parse('node test.js bar --red -N'.split(' '));
+    }).toThrow("error: option '--red' cannot be used with option '-N, --no-color'");
+  });
+
+  test('should report conflict on negated option env variable', () => {
+    const { program } = makeProgram();
+
+    process.env.NO_COLOR = true;
+
+    program
+      .command('bar')
+      .addOption(new commander.Option('--red').conflicts(['color']))
+      .addOption(new commander.Option('--color'))
+      .addOption(new commander.Option('-N, --no-color').env('NO_COLOR'));
+
+    expect(() => {
+      program.parse('node test.js bar --red'.split(' '));
+    }).toThrow("error: option '--red' cannot be used with environment variable 'NO_COLOR'");
+  });
 });