diff --git a/src/Knp/Snappy/AbstractGenerator.php b/src/Knp/Snappy/AbstractGenerator.php
index fec44b15..dcfcf767 100644
--- a/src/Knp/Snappy/AbstractGenerator.php
+++ b/src/Knp/Snappy/AbstractGenerator.php
@@ -433,6 +433,8 @@ protected function buildCommand($binary, $input, $output, array $options = array
                     // Dont't add '--' if option is "cover"  or "toc".
                     if (in_array($key, array('toc', 'cover'))) {
                         $command .= ' '.$key.' '.escapeshellarg($option);
+                    } elseif (in_array($key, ['image-dpi', 'image-quality'])) {
+                        $command .= ' --'.$key.' '. (int) $option;
                     } else {
                         $command .= ' --'.$key.' '.escapeshellarg($option);
                     }
diff --git a/test/Knp/Snappy/AbstractGeneratorTest.php b/test/Knp/Snappy/AbstractGeneratorTest.php
index 96403033..c0c8c3b3 100644
--- a/test/Knp/Snappy/AbstractGeneratorTest.php
+++ b/test/Knp/Snappy/AbstractGeneratorTest.php
@@ -527,6 +527,16 @@ public function dataForBuildCommand()
                 ),
                 $theBinary . ' --allow ' . escapeshellarg('/path1') . ' --allow ' . escapeshellarg('/path2') . ' --no-background ' . escapeshellarg('1') . ' ' . escapeshellarg('http://the.url/') . ' ' . escapeshellarg('/the/path')
             ),
+            [
+                $theBinary,
+                'http://the.url/',
+                '/the/path',
+                [
+                    'image-dpi' => 100,
+                    'image-quality' => 50,
+                ],
+                $theBinary . ' ' . '--image-dpi 100 --image-quality 50 ' . escapeshellarg('http://the.url/') . ' ' . escapeshellarg('/the/path')
+            ],
         );
     }
 
@@ -756,7 +766,7 @@ public function dataForIsAssociativeArray()
             ),
         );
     }
-    
+
     public function testCleanupEmptyTemporaryFiles()
     {
         $generator = $this->getMock(
@@ -772,20 +782,20 @@ public function testCleanupEmptyTemporaryFiles()
         $generator
             ->expects($this->once())
             ->method('unlink');
-        
+
         $create = new \ReflectionMethod($generator, 'createTemporaryFile');
         $create->setAccessible(true);
         $create->invoke($generator, null, null);
-        
+
         $files = new \ReflectionProperty($generator, 'temporaryFiles');
         $files->setAccessible(true);
         $this->assertCount(1, $files->getValue($generator));
-        
+
         $remove = new \ReflectionMethod($generator, 'removeTemporaryFiles');
         $remove->setAccessible(true);
         $remove->invoke($generator);
     }
-    
+
     public function testleanupTemporaryFiles()
     {
         $generator = $this->getMock(
@@ -801,15 +811,15 @@ public function testleanupTemporaryFiles()
         $generator
             ->expects($this->once())
             ->method('unlink');
-        
+
         $create = new \ReflectionMethod($generator, 'createTemporaryFile');
         $create->setAccessible(true);
         $create->invoke($generator, '<html/>', 'html');
-        
+
         $files = new \ReflectionProperty($generator, 'temporaryFiles');
         $files->setAccessible(true);
         $this->assertCount(1, $files->getValue($generator));
-        
+
         $remove = new \ReflectionMethod($generator, 'removeTemporaryFiles');
         $remove->setAccessible(true);
         $remove->invoke($generator);