diff --git a/src/ChildProcess/Adapter.php b/src/ChildProcess/Adapter.php
index 45fdd484..d1ebdee6 100644
--- a/src/ChildProcess/Adapter.php
+++ b/src/ChildProcess/Adapter.php
@@ -195,7 +195,7 @@ public function read($fileDescriptor, $length, $offset)
             'length' => $length,
             'offset' => $offset,
         ]))->then(function ($payload) {
-            return \React\Promise\resolve($payload['chunk']);
+            return \React\Promise\resolve(base64_decode($payload['chunk']));
         });
     }
 
@@ -209,7 +209,7 @@ public function read($fileDescriptor, $length, $offset)
     public function write($fileDescriptor, $data, $length, $offset)
     {
         return $this->fileDescriptors[$fileDescriptor]->rpc(Factory::rpc('write', [
-            'chunk' => $data,
+            'chunk' => base64_encode($data),
             'length' => $length,
             'offset' => $offset,
         ]));
diff --git a/src/WoolTrait.php b/src/WoolTrait.php
index 497a7e38..d786b6b4 100644
--- a/src/WoolTrait.php
+++ b/src/WoolTrait.php
@@ -172,7 +172,7 @@ public function read(array $payload)
     {
         fseek($this->fd, $payload['offset']);
         return \React\Promise\resolve([
-            'chunk' => fread($this->fd, $payload['length']),
+            'chunk' => base64_encode(fread($this->fd, $payload['length'])),
         ]);
     }
 
@@ -184,7 +184,7 @@ public function write(array $payload)
     {
         fseek($this->fd, $payload['offset']);
         return \React\Promise\resolve([
-            'written' => fwrite($this->fd, $payload['chunk'], $payload['length']),
+            'written' => fwrite($this->fd, base64_decode($payload['chunk']), $payload['length']),
         ]);
     }
 
diff --git a/tests/Adapters/FileTest.php b/tests/Adapters/FileTest.php
index ce26747a..f0e43fe0 100644
--- a/tests/Adapters/FileTest.php
+++ b/tests/Adapters/FileTest.php
@@ -151,6 +151,17 @@ public function testGetContents(LoopInterface $loop, FilesystemInterface $filesy
         $this->assertSame($contents, $fileContents);
     }
 
+    /**
+     * @dataProvider filesystemProvider
+     */
+    public function testGetBinaryContents(LoopInterface $loop, FilesystemInterface $filesystem)
+    {
+        $file = __DIR__ . DIRECTORY_SEPARATOR . 'reactphp-logo.png';
+        $this->assertFileExists($file);
+        $fileContents = $this->await($filesystem->file($file)->getContents(), $loop);
+        $this->assertSame(file_get_contents($file), $fileContents);
+    }
+
     /**
      * @dataProvider filesystemProvider
      */
@@ -257,4 +268,16 @@ public function testPutContents(LoopInterface $loop, FilesystemInterface $filesy
         $this->assertFileExists($tempFile);
         $this->assertSame($contents, file_get_contents($tempFile));
     }
+    /**
+     * @dataProvider filesystemProvider
+     */
+    public function testPutBinaryContents(LoopInterface $loop, FilesystemInterface $filesystem)
+    {
+        $contents = file_get_contents(__DIR__ . DIRECTORY_SEPARATOR . 'reactphp-logo.png');
+        $filename = uniqid('', true);
+        $tempFile = $this->tmpDir . $filename;
+        $this->await($filesystem->file($tempFile)->putContents($contents), $loop);
+        $this->assertFileExists($tempFile);
+        $this->assertSame($contents, file_get_contents($tempFile));
+    }
 }
diff --git a/tests/Adapters/reactphp-logo.png b/tests/Adapters/reactphp-logo.png
new file mode 100644
index 00000000..001a8c8d
Binary files /dev/null and b/tests/Adapters/reactphp-logo.png differ