diff --git a/src/Spout/Reader/Helper/XLSX/SharedStringsHelper.php b/src/Spout/Reader/Helper/XLSX/SharedStringsHelper.php
index b1a239c..89f0004 100644
--- a/src/Spout/Reader/Helper/XLSX/SharedStringsHelper.php
+++ b/src/Spout/Reader/Helper/XLSX/SharedStringsHelper.php
@@ -31,6 +31,9 @@ class SharedStringsHelper
      */
     const MAX_NUM_STRINGS_PER_TEMP_FILE = 10000;
 
+    /** Value to use to escape the line feed character ("\n") */
+    const ESCAPED_LINE_FEED_CHARACTER = '_x000A_';
+
     /** @var string Path of the XLSX file being read */
     protected $filePath;
 
@@ -80,7 +83,6 @@ class SharedStringsHelper
      * Please note that SimpleXML does not provide such a functionality but since it is faster
      * and more handy to parse few XML nodes, it is used in combination with XMLReader for that purpose.
      *
-     * @param  string $filePath
      * @return void
      * @throws \Box\Spout\Common\Exception\IOException If sharedStrings.xml can't be read
      */
@@ -120,7 +122,12 @@ class SharedStringsHelper
             }
 
             $unescapedTextValue = $escaper->unescape($textValue);
-            $this->writeSharedStringToTempFile($unescapedTextValue, $sharedStringIndex);
+
+            // The shared string retrieval logic expects each cell data to be on one line only
+            // Encoding the line feed character allows to preserve this assumption
+            $lineFeedEncodedTextValue = $this->escapeLineFeed($unescapedTextValue);
+
+            $this->writeSharedStringToTempFile($lineFeedEncodedTextValue, $sharedStringIndex);
 
             $sharedStringIndex++;
 
@@ -246,7 +253,8 @@ class SharedStringsHelper
 
         $sharedString = null;
         if (array_key_exists($indexInFile, $this->inMemoryTempFileContents)) {
-            $sharedString = $this->inMemoryTempFileContents[$indexInFile];
+            $escapedSharedString = $this->inMemoryTempFileContents[$indexInFile];
+            $sharedString = $this->unescapeLineFeed($escapedSharedString);
         }
 
         if (!$sharedString) {
@@ -256,6 +264,28 @@ class SharedStringsHelper
         return rtrim($sharedString, PHP_EOL);
     }
 
+    /**
+     * Escapes the line feed character (\n)
+     *
+     * @param string $unescapedString
+     * @return string
+     */
+    private function escapeLineFeed($unescapedString)
+    {
+        return str_replace("\n", self::ESCAPED_LINE_FEED_CHARACTER, $unescapedString);
+    }
+
+    /**
+     * Unescapes the line feed character (\n)
+     *
+     * @param string $escapedString
+     * @return string
+     */
+    private function unescapeLineFeed($escapedString)
+    {
+        return str_replace(self::ESCAPED_LINE_FEED_CHARACTER, "\n", $escapedString);
+    }
+
     /**
      * Deletes the created temporary folder and all its contents
      *
diff --git a/src/Spout/Writer/Internal/XLSX/Workbook.php b/src/Spout/Writer/Internal/XLSX/Workbook.php
index 3f8cca4..e6ca0db 100644
--- a/src/Spout/Writer/Internal/XLSX/Workbook.php
+++ b/src/Spout/Writer/Internal/XLSX/Workbook.php
@@ -5,7 +5,6 @@ namespace Box\Spout\Writer\Internal\XLSX;
 use Box\Spout\Writer\Exception\SheetNotFoundException;
 use Box\Spout\Writer\Helper\XLSX\FileSystemHelper;
 use Box\Spout\Writer\Helper\XLSX\SharedStringsHelper;
-use Box\Spout\Writer\Helper\XLSX\ZipHelper;
 use Box\Spout\Writer\Sheet;
 
 /**
diff --git a/src/Spout/Writer/Internal/XLSX/Worksheet.php b/src/Spout/Writer/Internal/XLSX/Worksheet.php
index 326c41b..4a13dea 100644
--- a/src/Spout/Writer/Internal/XLSX/Worksheet.php
+++ b/src/Spout/Writer/Internal/XLSX/Worksheet.php
@@ -42,7 +42,8 @@ EOD;
 
     /**
      * @param \Box\Spout\Writer\Sheet $externalSheet The associated "external" sheet
-     * @param string $tempFolder Temporary folder where the files to create the XLSX will be stored
+     * @param string $worksheetFilesFolder Temporary folder where the files to create the XLSX will be stored
+     * @param \Box\Spout\Writer\Helper\XLSX\SharedStringsHelper $sharedStringsHelper Helper for shared strings
      * @param bool $shouldUseInlineStrings Whether inline or shared strings should be used
      * @throws \Box\Spout\Common\Exception\IOException If the sheet data file cannot be opened for writing
      */
diff --git a/tests/Spout/Reader/Helper/XLSX/SharedStringsHelperTest.php b/tests/Spout/Reader/Helper/XLSX/SharedStringsHelperTest.php
index 110c04d..c868863 100644
--- a/tests/Spout/Reader/Helper/XLSX/SharedStringsHelperTest.php
+++ b/tests/Spout/Reader/Helper/XLSX/SharedStringsHelperTest.php
@@ -46,7 +46,7 @@ class SharedStringsHelperTest extends \PHPUnit_Framework_TestCase
         $this->assertEquals(1, count($filesInTempFolder), 'One temp file should have been created in the temp folder.');
 
         $tempFileContents = file_get_contents($filesInTempFolder[0]);
-        $tempFileContentsPerLine = explode("\n", $tempFileContents);
+        $tempFileContentsPerLine = explode(PHP_EOL, $tempFileContents);
 
         $this->assertEquals('s1--A1', $tempFileContentsPerLine[0]);
         $this->assertEquals('s1--E5', $tempFileContentsPerLine[24]);
@@ -96,4 +96,23 @@ class SharedStringsHelperTest extends \PHPUnit_Framework_TestCase
         $sharedString = $this->sharedStringsHelper->getStringAtIndex(24);
         $this->assertEquals('s1--E5', $sharedString);
     }
+
+    /**
+     * @return void
+     */
+    public function testGetStringAtIndexShouldWorkWithMultilineStrings()
+    {
+        $resourcePath = $this->getResourcePath('one_sheet_with_shared_multiline_strings.xlsx');
+        $sharedStringsHelper = new SharedStringsHelper($resourcePath);
+
+        $sharedStringsHelper->extractSharedStrings();
+
+        $sharedString = $sharedStringsHelper->getStringAtIndex(0);
+        $this->assertEquals("s1\nA1", $sharedString);
+
+        $sharedString = $sharedStringsHelper->getStringAtIndex(24);
+        $this->assertEquals("s1\nE5", $sharedString);
+
+        $sharedStringsHelper->cleanup();
+    }
 }
diff --git a/tests/Spout/Writer/CSVTest.php b/tests/Spout/Writer/CSVTest.php
index 0d8478b..bfbc71f 100644
--- a/tests/Spout/Writer/CSVTest.php
+++ b/tests/Spout/Writer/CSVTest.php
@@ -135,6 +135,6 @@ class CSVTest extends \PHPUnit_Framework_TestCase
     private function trimWrittenContent($writtenContent)
     {
         // remove line feeds and UTF-8 BOM
-        return trim($writtenContent, "\n" . CSV::UTF8_BOM);
+        return trim($writtenContent, PHP_EOL . CSV::UTF8_BOM);
     }
 }
diff --git a/tests/resources/xlsx/one_sheet_with_shared_multiline_strings.xlsx b/tests/resources/xlsx/one_sheet_with_shared_multiline_strings.xlsx
new file mode 100644
index 0000000..bfe9e8b
Binary files /dev/null and b/tests/resources/xlsx/one_sheet_with_shared_multiline_strings.xlsx differ