diff --git a/src/AWS/CRT/IO/InputStream.php b/src/AWS/CRT/IO/InputStream.php
index ae5fd46..d71d31e 100644
--- a/src/AWS/CRT/IO/InputStream.php
+++ b/src/AWS/CRT/IO/InputStream.php
@@ -14,6 +14,7 @@ final class InputStream extends NativeResource {
     const SEEK_END = 2;
 
     public function __construct($stream) {
+        parent::__construct();
         $this->stream = $stream;
         $options = self::$crt->input_stream_options_new();
         // The stream implementation in native just converts the PHP stream into
diff --git a/tests/StreamTest.php b/tests/StreamTest.php
index 408b573..5657622 100644
--- a/tests/StreamTest.php
+++ b/tests/StreamTest.php
@@ -18,17 +18,17 @@ final class InputStreamTest extends CrtTestCase {
         return $stream;
     }
 
-    // public function testMemoryStream() {
-    //     $mem_stream = $this->getMemoryStream();
-    //     $stream = new InputStream($mem_stream);
-    //     $this->assertNotNull($stream, "Failed to create InputStream from PHP memory stream");
-    //     $this->assertEquals(strlen(self::MEM_STREAM_CONTENTS), $stream->length(), "Stream length doesn't match source buffer");
-    //     $this->assertEquals(self::MEM_STREAM_CONTENTS, $stream->read(), "Stream doesn't match source buffer");
-    //     $this->assertTrue($stream->eof(), "Stream is not EOF after reading");
-    //     $this->assertEquals(0, $stream->seek(0, InputStream::SEEK_BEGIN), "Unable to rewind stream");
-    //     $this->assertFalse($stream->eof(), "Stream is EOF after rewinding");
-    //     $this->assertEquals(0, $stream->seek(0, InputStream::SEEK_END), "Unable to seek to end of stream");
-    //     $this->assertTrue($stream->eof(), "Stream is not EOF after seeking to end");
-    //     $stream = null;
-    // }
+     public function testMemoryStream() {
+         $mem_stream = $this->getMemoryStream();
+         $stream = new InputStream($mem_stream);
+         $this->assertNotNull($stream, "Failed to create InputStream from PHP memory stream");
+         $this->assertEquals(strlen(self::MEM_STREAM_CONTENTS), $stream->length(), "Stream length doesn't match source buffer");
+         $this->assertEquals(self::MEM_STREAM_CONTENTS, $stream->read(), "Stream doesn't match source buffer");
+         $this->assertTrue($stream->eof(), "Stream is not EOF after reading");
+         $this->assertEquals(0, $stream->seek(0, InputStream::SEEK_BEGIN), "Unable to rewind stream");
+         $this->assertFalse($stream->eof(), "Stream is EOF after rewinding");
+         $this->assertEquals(0, $stream->seek(0, InputStream::SEEK_END), "Unable to seek to end of stream");
+         $this->assertTrue($stream->eof(), "Stream is not EOF after seeking to end");
+         $stream = null;
+     }
 }