diff --git a/app/code/Magento/Log/Console/Command/LogCleanCommand.php b/app/code/Magento/Log/Console/Command/LogCleanCommand.php
index 76900912d8dcadb9dacb942fd2d69de5149c445b..8934199373fffc7f9ad19f6cbbd10baa0a4225b2 100644
--- a/app/code/Magento/Log/Console/Command/LogCleanCommand.php
+++ b/app/code/Magento/Log/Console/Command/LogCleanCommand.php
@@ -30,7 +30,8 @@ class LogCleanCommand extends AbstractLogCommand
                 self::INPUT_KEY_DAYS,
                 null,
                 InputOption::VALUE_REQUIRED,
-                'Save log for specified number of days (minimum 1 day)'
+                'Save log for specified number of days',
+                '1'
             ),
         ];
         $this->setName('log:clean')
@@ -41,19 +42,26 @@ class LogCleanCommand extends AbstractLogCommand
 
     /**
      * {@inheritdoc}
+     * @throws \InvalidArgumentException
      */
     protected function execute(InputInterface $input, OutputInterface $output)
     {
+        $errorMsg = 'Invalid value for option "' . self::INPUT_KEY_DAYS . '"';
         $days = $input->getOption(self::INPUT_KEY_DAYS);
-        if ($days > 0) {
-            /** @var \Magento\Framework\App\Config\MutableScopeConfigInterface $mutableConfig */
-            $mutableConfig = $this->objectManager->create('Magento\Framework\App\Config\MutableScopeConfigInterface');
-            $mutableConfig->setValue(
-                \Magento\Log\Model\Log::XML_LOG_CLEAN_DAYS,
-                $days,
-                \Magento\Store\Model\ScopeInterface::SCOPE_STORE
-            );
+        if (!is_numeric($days) || (strpos($days,'.') !== false)) {
+            throw new \InvalidArgumentException($errorMsg);
         }
+        $days = (int) $days;
+        if ($days <= 0) {
+            throw new \InvalidArgumentException($errorMsg);
+        }
+        /** @var \Magento\Framework\App\Config\MutableScopeConfigInterface $mutableConfig */
+        $mutableConfig = $this->objectManager->create('Magento\Framework\App\Config\MutableScopeConfigInterface');
+        $mutableConfig->setValue(
+            \Magento\Log\Model\Log::XML_LOG_CLEAN_DAYS,
+            $days,
+            \Magento\Store\Model\ScopeInterface::SCOPE_STORE
+        );
         /** @var \Magento\Log\Model\LogFactory $logFactory */
         $logFactory = $this->objectManager->create('Magento\Log\Model\LogFactory');
         /** @var \Magento\Log\Model\Log $model */
diff --git a/app/code/Magento/Log/Test/Unit/Console/Command/LogCleanCommandTest.php b/app/code/Magento/Log/Test/Unit/Console/Command/LogCleanCommandTest.php
index 1e5ce8f05e6c314c3b88c816817f951c679cdbec..2b742e8ceeba227aed5f26655bdf62f86969f07b 100644
--- a/app/code/Magento/Log/Test/Unit/Console/Command/LogCleanCommandTest.php
+++ b/app/code/Magento/Log/Test/Unit/Console/Command/LogCleanCommandTest.php
@@ -7,9 +7,28 @@ namespace Magento\Log\Test\Unit\Console\Command;
 
 use Magento\Log\Console\Command\LogCleanCommand;
 use Symfony\Component\Console\Tester\CommandTester;
+use Magento\Framework\App\ObjectManager;
 
 class LogCleanCommandTest extends \PHPUnit_Framework_TestCase
 {
+    /**
+     * @var ObjectManager|\PHPUnit_Framework_MockObject_MockObject
+     */
+    private $objectManager;
+
+    /**
+     * @var CommandTester
+     */
+    private $commandTester;
+
+    public function setUp()
+    {
+        $this->objectManager = $this->getMock('Magento\Framework\App\ObjectManager', [], [], '', false);
+        $objectManagerFactory = $this->getMock('Magento\Framework\App\ObjectManagerFactory', [], [], '', false);
+        $objectManagerFactory->expects($this->once())->method('create')->willReturn($this->objectManager);
+        $this->commandTester = new CommandTester(new LogCleanCommand($objectManagerFactory));
+    }
+
     public function testExecute()
     {
         $mutableConfig = $this->getMock('Magento\Framework\App\Config\MutableScopeConfigInterface', [], [], '', false);
@@ -26,16 +45,41 @@ class LogCleanCommandTest extends \PHPUnit_Framework_TestCase
                 $logFactory,
             ],
         ];
-        $objectManager = $this->getMock('Magento\Framework\App\ObjectManager', [], [], '', false);
-        $objectManager->expects($this->exactly(2))->method('create')->will($this->returnValueMap($returnValueMap));
+        $this->objectManager
+            ->expects($this->exactly(2))->method('create')
+            ->will($this->returnValueMap($returnValueMap));
         $mutableConfig->expects($this->once())->method('setValue');
         $log = $this->getMock('Magento\Log\Model\Log', [], [], '', false);
         $logFactory->expects($this->once())->method('create')->willReturn($log);
         $log->expects($this->once())->method('clean');
-        $objectManagerFactory = $this->getMock('Magento\Framework\App\ObjectManagerFactory', [], [], '', false);
-        $objectManagerFactory->expects($this->once())->method('create')->willReturn($objectManager);
-        $commandTester = new CommandTester(new LogCleanCommand($objectManagerFactory));
-        $commandTester->execute(['--days' => '1']);
-        $this->assertEquals('Log cleaned.' . PHP_EOL, $commandTester->getDisplay());
+        $this->commandTester->execute(['--days' => '1']);
+        $this->assertEquals('Log cleaned.' . PHP_EOL, $this->commandTester->getDisplay());
+    }
+
+    /**
+     * @expectedException \InvalidArgumentException
+     * @expectedExceptionMessage Invalid value for option "days"
+     */
+    public function testExecuteInvalidNegativeDays()
+    {
+        $this->commandTester->execute(['--days' => '-1']);
+    }
+
+    /**
+     * @expectedException \InvalidArgumentException
+     * @expectedExceptionMessage Invalid value for option "days"
+     */
+    public function testExecuteInvalidFractionDays()
+    {
+        $this->commandTester->execute(['--days' => '5.5']);
+    }
+
+    /**
+     * @expectedException \InvalidArgumentException
+     * @expectedExceptionMessage Invalid value for option "days"
+     */
+    public function testExecuteInvalidTexyDays()
+    {
+        $this->commandTester->execute(['--days' => 'test']);
     }
 }