diff --git a/src/Spout/Reader/Common/Creator/ReaderFactory.php b/src/Spout/Reader/Common/Creator/ReaderFactory.php
index 6b10175..c16d469 100644
--- a/src/Spout/Reader/Common/Creator/ReaderFactory.php
+++ b/src/Spout/Reader/Common/Creator/ReaderFactory.php
@@ -28,6 +28,16 @@ use Box\Spout\Reader\XLSX\Reader as XLSXReader;
  */
 class ReaderFactory
 {
+    /**
+     * File extensions and readers mapped
+     */
+    protected const MAPPED_EXTENSIONS = [
+        'xlsx' => 'xlsx',
+        'csv' => 'csv',
+        'ods' => 'ods',
+        'xlsm' => 'xlsx',
+    ];
+
     /**
      * Creates a reader by file extension
      *
@@ -42,6 +52,15 @@ class ReaderFactory
         return self::createFromType($extension);
     }
 
+    public static function getMappedFormats(string $fileExtension)
+    {
+        if (!(array_key_exists($fileExtension, self::MAPPED_EXTENSIONS))) {
+            throw new UnsupportedTypeException('No readers supporting the given type: ' . $fileExtension);
+        }
+
+        return self::MAPPED_EXTENSIONS[$fileExtension];
+    }
+
     /**
      * This creates an instance of the appropriate reader, given the type of the file to be read
      *
@@ -51,13 +70,10 @@ class ReaderFactory
      */
     public static function createFromType($readerType)
     {
-        switch ($readerType) {
-            case Type::CSV: return self::createCSVReader();
-            case Type::XLSX: return self::createXLSXReader();
-            case Type::ODS: return self::createODSReader();
-            default:
-                throw new UnsupportedTypeException('No readers supporting the given type: ' . $readerType);
-        }
+        $readerType = self::getMappedFormats($readerType);
+        $methodName = 'create' . strtoupper($readerType) . 'Reader';
+
+        return self::$methodName();
     }
 
     /**
diff --git a/tests/Spout/Reader/XLSM/ReaderTest.php b/tests/Spout/Reader/XLSM/ReaderTest.php
new file mode 100644
index 0000000..6e15382
--- /dev/null
+++ b/tests/Spout/Reader/XLSM/ReaderTest.php
@@ -0,0 +1,73 @@
+<?php
+
+use Box\Spout\Reader\Common\Creator\ReaderEntityFactory;
+use Box\Spout\TestUsingResource;
+use PHPUnit\Framework\TestCase;
+
+/**
+ * Class ReaderTest
+ */
+class ReaderTest extends TestCase
+{
+    use TestUsingResource;
+
+    /**
+     * @return void
+     */
+    public function testReaderFactoryShouldReturnXLSXReader()
+    {
+        $resourcePath = $this->getResourcePath('simple-xlsm-sample.xlsm');
+        $reader = ReaderEntityFactory::createReaderFromFile($resourcePath);
+
+        $this->assertInstanceOf(Box\Spout\Reader\ReaderInterface::class, $reader);
+    }
+
+    /**
+     * @return void
+     */
+    public function testReadXLSMSpreadsheetShouldReturnData()
+    {
+        $this->assertNotEmpty($this->getAllRowsForFile('simple-xlsm-sample.xlsm'));
+    }
+
+    /**
+     * @return void
+     */
+    public function testSpreadsheetRowsShouldMatch()
+    {
+        $expectedRows = [
+            ['a1', 'b1', 'c1'],
+            ['a2', 'b2', 'c2'],
+            ['a3', 'b3', 'c3'],
+        ];
+
+        $this->assertEquals($expectedRows, $this->getAllRowsForFile('simple-xlsm-sample.xlsm'));
+    }
+
+    /**
+     * @param string $fileName
+     * @param bool $shouldFormatDates
+     * @param bool $shouldPreserveEmptyRows
+     * @return array All the read rows the given file
+     */
+    private function getAllRowsForFile($fileName, $shouldFormatDates = false, $shouldPreserveEmptyRows = false)
+    {
+        $allRows = [];
+        $resourcePath = $this->getResourcePath($fileName);
+
+        $reader = ReaderEntityFactory::createXLSXReader();
+        $reader->setShouldFormatDates($shouldFormatDates);
+        $reader->setShouldPreserveEmptyRows($shouldPreserveEmptyRows);
+        $reader->open($resourcePath);
+
+        foreach ($reader->getSheetIterator() as $sheetIndex => $sheet) {
+            foreach ($sheet->getRowIterator() as $rowIndex => $row) {
+                $allRows[] = $row->toArray();
+            }
+        }
+
+        $reader->close();
+
+        return $allRows;
+    }
+}
diff --git a/tests/Spout/TestUsingResource.php b/tests/Spout/TestUsingResource.php
index 551f86b..defebc0 100644
--- a/tests/Spout/TestUsingResource.php
+++ b/tests/Spout/TestUsingResource.php
@@ -8,7 +8,7 @@ namespace Box\Spout;
 trait TestUsingResource
 {
     /** @var string Path to the test resources folder */
-    private $resourcesPath = 'tests/resources';
+    private $resourcesPath = __DIR__ . '/../../tests/resources';
 
     /** @var string Path to the test generated resources folder */
     private $generatedResourcesPath = 'tests/resources/generated';
diff --git a/tests/resources/xlsm/simple-xlsm-sample.xlsm b/tests/resources/xlsm/simple-xlsm-sample.xlsm
new file mode 100644
index 0000000..028b1fb
Binary files /dev/null and b/tests/resources/xlsm/simple-xlsm-sample.xlsm differ