diff --git a/src/PictureGenerator.php b/src/PictureGenerator.php
index 64eea3c..1785ba5 100644
--- a/src/PictureGenerator.php
+++ b/src/PictureGenerator.php
@@ -172,8 +172,8 @@ function ($density) use ($width1x) {
     private function generateSrcsetItem(ImageInterface $image, PictureConfigurationItemInterface $config, $density, $descriptorType, $width1x)
     {
         $resizeConfig = clone $config->getResizeConfig();
-        $resizeConfig->setWidth($resizeConfig->getWidth() * $density);
-        $resizeConfig->setHeight($resizeConfig->getHeight() * $density);
+        $resizeConfig->setWidth(round($resizeConfig->getWidth() * $density));
+        $resizeConfig->setHeight(round($resizeConfig->getHeight() * $density));
 
         $resizedImage = $this->resizer->resize($image, $resizeConfig, $this->resizeOptions);
 
diff --git a/tests/PictureGeneratorTest.php b/tests/PictureGeneratorTest.php
index cec82c6..b31188c 100644
--- a/tests/PictureGeneratorTest.php
+++ b/tests/PictureGeneratorTest.php
@@ -102,7 +102,7 @@ function (
 
         $pictureConfig = (new PictureConfiguration())
             ->setSize((new PictureConfigurationItem())
-                ->setDensities('1x, 1.35354x, 2x')
+                ->setDensities('1x, 1.35354x, 1.9999x')
                 ->setResizeConfig((new ResizeConfiguration())
                     ->setWidth(99)
                     ->setHeight(99)