diff --git a/services/Sanitizers/NodeSanitizer.php b/services/Sanitizers/NodeSanitizer.php
index 13f45c0..5a57a04 100644
--- a/services/Sanitizers/NodeSanitizer.php
+++ b/services/Sanitizers/NodeSanitizer.php
@@ -59,7 +59,7 @@ abstract class NodeSanitizer implements NodeTypeSanitizerInterface {
 		$this->removeNodesBySelector( $xpath, $this->selectorsForFullRemoval );
 		$nodes = $this->extractNeededNodes( $xpath );
 
-		return $this->generateHTML( $nodes, $dom );
+		return $this->normalizeWhitespace( $this->generateHTML( $nodes, $dom ) );
 	}
 
 	/**
@@ -78,7 +78,18 @@ abstract class NodeSanitizer implements NodeTypeSanitizerInterface {
 			 */
 			$result[] = ( $node->nodeName === '#text' ) ? htmlspecialchars( $dom->saveHTML( $node ), ENT_QUOTES ) : $dom->saveHTML( $node );
 		}
-		return implode( '', $result );
+		return implode( ' ', $result );
+	}
+
+	/**
+	 * Replaces multiple whitespaces with single ones.
+	 * Transparent from non-preformatted HTML point of view
+	 *
+	 * @param $text string
+	 * @return string
+	 */
+	protected function normalizeWhitespace( $text ) {
+		return mbereg_replace( "\s+", " ", $text );
 	}
 
 	/**
diff --git a/tests/sanitizers/NodeImageSanitizerTest.php b/tests/sanitizers/NodeImageSanitizerTest.php
index 5b9cf44..77df8fd 100644
--- a/tests/sanitizers/NodeImageSanitizerTest.php
+++ b/tests/sanitizers/NodeImageSanitizerTest.php
@@ -43,6 +43,21 @@ class NodeImageSanitizerTest extends WikiaBaseTest {
 			[
 				[ 'caption' => '<script>JSSnippetsStack.push({dependencies:[{"url":"http://i3.marzjan.wikia-dev.com/__am/1451462348/group/-/wikia_photo_gallery_js","type":"js"},{"url":"http://i2.marzjan.wikia-dev.com/__am/1451462348/sass/background-dynamic%3D1%26background-image%3D%26background-image-height%3D1185%26background-image-width%3D1600%26color-body%3D%2523bacdd8%26color-body-middle%3D%2523bacdd8%26color-buttons%3D%2523006cb0%26color-header%3D%25233a5766%26color-links%3D%2523006cb0%26color-page%3D%2523ffffff%26oasisTypography%3D1%26page-opacity%3D100%26widthType%3D0/extensions/wikia/WikiaPhotoGallery/css/gallery.scss","type":"css"}],callback:function(json){WikiaPhotoGalleryView.init(json)},id:"WikiaPhotoGalleryView.init"})</script>' ],
 				[ 'caption' => '' ]
+			],
+			[
+				[ 'caption' => '<ul><li>1
+</li><li>2
+</li><li>3
+</li></ul>' ],
+				[ 'caption' => '1 2 3' ]
+			],
+			[
+				[ 'caption' => '<ol><li>1
+</li><li>2
+<ol><li>2.1
+</li></ol>
+</li></ol>' ],
+				[ 'caption' => '1 2 2.1' ]
 			]
 		];
 	}