diff --git a/src/Spout/Writer/ODS/Internal/Worksheet.php b/src/Spout/Writer/ODS/Internal/Worksheet.php
index f0544f0..7a0df1a 100644
--- a/src/Spout/Writer/ODS/Internal/Worksheet.php
+++ b/src/Spout/Writer/ODS/Internal/Worksheet.php
@@ -134,6 +134,10 @@ class Worksheet implements WorksheetInterface
      */
     public function addRow($dataRow, $style)
     {
+        // $dataRow can be an associative array. We need to transform
+        // it into a regular array, as we'll use the numeric indexes.
+        $dataRowWithNumericIndexes = array_values($dataRow);
+
         $styleIndex = ($style->getId() + 1); // 1-based
         $cellsCount = count($dataRow);
         $this->maxNumColumns = max($this->maxNumColumns, $cellsCount);
@@ -144,10 +148,12 @@ class Worksheet implements WorksheetInterface
         $nextCellIndex = 1;
 
         for ($i = 0; $i < $cellsCount; $i++) {
-            $currentCellValue = $dataRow[$currentCellIndex];
+            $currentCellValue = $dataRowWithNumericIndexes[$currentCellIndex];
 
             // Using isset here because it is way faster than array_key_exists...
-            if (!isset($dataRow[$nextCellIndex]) || $currentCellValue !== $dataRow[$nextCellIndex]) {
+            if (!isset($dataRowWithNumericIndexes[$nextCellIndex]) ||
+                $currentCellValue !== $dataRowWithNumericIndexes[$nextCellIndex]) {
+
                 $numTimesValueRepeated = ($nextCellIndex - $currentCellIndex);
                 $data .= $this->getCellContent($currentCellValue, $styleIndex, $numTimesValueRepeated);
 
diff --git a/tests/Spout/Writer/CSV/WriterTest.php b/tests/Spout/Writer/CSV/WriterTest.php
index fce430f..ee343c2 100644
--- a/tests/Spout/Writer/CSV/WriterTest.php
+++ b/tests/Spout/Writer/CSV/WriterTest.php
@@ -74,6 +74,20 @@ class WriterTest extends \PHPUnit_Framework_TestCase
         $this->assertContains(EncodingHelper::BOM_UTF8, $writtenContent, 'The CSV file should contain a UTF-8 BOM');
     }
 
+    /**
+     * @return void
+     */
+    public function testWriteShouldSupportAssociativeArrays()
+    {
+        $allRows = [
+            ['foo' => 'csv--11', 'bar' => 'csv--12'],
+        ];
+        $writtenContent = $this->writeToCsvFileAndReturnWrittenContent($allRows, 'csv_from_associative_arrays.csv');
+        $writtenContent = $this->trimWrittenContent($writtenContent);
+
+        $this->assertEquals('csv--11,csv--12', $writtenContent, 'Values from associative arrays should be written');
+    }
+
     /**
      * @return void
      */
diff --git a/tests/Spout/Writer/ODS/WriterTest.php b/tests/Spout/Writer/ODS/WriterTest.php
index f00f485..4c67e4e 100644
--- a/tests/Spout/Writer/ODS/WriterTest.php
+++ b/tests/Spout/Writer/ODS/WriterTest.php
@@ -23,7 +23,7 @@ class WriterTest extends \PHPUnit_Framework_TestCase
     public function testAddRowShouldThrowExceptionIfCannotOpenAFileForWriting()
     {
         $fileName = 'file_that_wont_be_written.ods';
-        $this->createUnwritableFolderIfNeeded($fileName);
+        $this->createUnwritableFolderIfNeeded();
         $filePath = $this->getGeneratedUnwritableResourcePath($fileName);
 
         $writer = WriterFactory::create(Type::ODS);
@@ -177,6 +177,25 @@ class WriterTest extends \PHPUnit_Framework_TestCase
         }
     }
 
+    /**
+     * @return void
+     */
+    public function testAddRowShouldSupportAssociativeArrays()
+    {
+        $fileName = 'test_add_row_should_support_associative_arrays.ods';
+        $dataRows = [
+            ['foo' => 'ods--11', 'bar' => 'ods--12'],
+        ];
+
+        $this->writeToODSFile($dataRows, $fileName);
+
+        foreach ($dataRows as $dataRow) {
+            foreach ($dataRow as $cellValue) {
+                $this->assertValueWasWritten($fileName, $cellValue);
+            }
+        }
+    }
+
     /**
      * @return void
      */
diff --git a/tests/Spout/Writer/XLSX/WriterTest.php b/tests/Spout/Writer/XLSX/WriterTest.php
index 7e10498..e74cd9c 100644
--- a/tests/Spout/Writer/XLSX/WriterTest.php
+++ b/tests/Spout/Writer/XLSX/WriterTest.php
@@ -21,7 +21,7 @@ class WriterTest extends \PHPUnit_Framework_TestCase
     public function testAddRowShouldThrowExceptionIfCannotOpenAFileForWriting()
     {
         $fileName = 'file_that_wont_be_written.xlsx';
-        $this->createUnwritableFolderIfNeeded($fileName);
+        $this->createUnwritableFolderIfNeeded();
         $filePath = $this->getGeneratedUnwritableResourcePath($fileName);
 
         $writer = WriterFactory::create(Type::XLSX);
@@ -232,6 +232,25 @@ class WriterTest extends \PHPUnit_Framework_TestCase
         }
     }
 
+    /**
+     * @return void
+     */
+    public function testAddRowShouldSupportAssociativeArrays()
+    {
+        $fileName = 'test_add_row_should_support_associative_arrays.xlsx';
+        $dataRows = [
+            ['foo' => 'xlsx--11', 'bar' => 'xlsx--12'],
+        ];
+
+        $this->writeToXLSXFile($dataRows, $fileName, $shouldUseInlineStrings = true);
+
+        foreach ($dataRows as $dataRow) {
+            foreach ($dataRow as $cellValue) {
+                $this->assertInlineDataWasWrittenToSheet($fileName, 1, $cellValue);
+            }
+        }
+    }
+
     /**
      * @return void
      */