diff --git a/src/Codec/GuidStringCodec.php b/src/Codec/GuidStringCodec.php
index dce190c..48f9ab1 100644
--- a/src/Codec/GuidStringCodec.php
+++ b/src/Codec/GuidStringCodec.php
@@ -25,6 +25,16 @@ use Ramsey\Uuid\UuidInterface;
  */
 class GuidStringCodec extends StringCodec
 {
+    /**
+     * @psalm-pure
+     */
+    public function encodeBinary(UuidInterface $uuid): string
+    {
+        $components = $this->swapBytes($this->extractComponents($uuid->toString()));
+
+        return (string) hex2bin(implode('', $components));
+    }
+
     /**
      * @throws InvalidUuidStringException
      *
diff --git a/src/Codec/StringCodec.php b/src/Codec/StringCodec.php
index 0a07d17..be63516 100644
--- a/src/Codec/StringCodec.php
+++ b/src/Codec/StringCodec.php
@@ -60,7 +60,7 @@ class StringCodec implements CodecInterface
      */
     public function encodeBinary(UuidInterface $uuid): string
     {
-        return $uuid->getBytes();
+        return (string) hex2bin($uuid->getHex());
     }
 
     /**
diff --git a/src/Uuid.php b/src/Uuid.php
index 1fcebd9..96ea639 100644
--- a/src/Uuid.php
+++ b/src/Uuid.php
@@ -277,7 +277,7 @@ class Uuid implements UuidInterface
 
     public function getBytes(): string
     {
-        return $this->fields->getBytes();
+        return $this->codec->encodeBinary($this);
     }
 
     /**
diff --git a/tests/Codec/StringCodecTest.php b/tests/Codec/StringCodecTest.php
index 0bff301..174604a 100644
--- a/tests/Codec/StringCodecTest.php
+++ b/tests/Codec/StringCodecTest.php
@@ -73,6 +73,8 @@ class StringCodecTest extends TestCase
     public function testEncodeBinaryReturnsBinaryString(): void
     {
         $expected = hex2bin('123456781234abcdabef1234abcd4321');
+        $this->uuid->method('getHex')
+            ->willReturn('123456781234abcdabef1234abcd4321');
         $this->uuid->method('getBytes')
             ->willReturn(hex2bin('123456781234abcdabef1234abcd4321'));
         $codec = new StringCodec($this->builder);
diff --git a/tests/Encoder/TimestampLastCombCodecTest.php b/tests/Encoder/TimestampLastCombCodecTest.php
index c045dc8..b26275a 100644
--- a/tests/Encoder/TimestampLastCombCodecTest.php
+++ b/tests/Encoder/TimestampLastCombCodecTest.php
@@ -45,6 +45,9 @@ class TimestampLastCombCodecTest extends TestCase
     {
         /** @var MockObject & UuidInterface $uuidMock */
         $uuidMock = $this->getMockBuilder(UuidInterface::class)->getMock();
+        $uuidMock->expects($this->any())
+            ->method('getHex')
+            ->willReturn('0800200c9a6611e19b21ff6f8cb0c57d');
         $uuidMock->expects($this->any())
             ->method('getBytes')
             ->willReturn(hex2bin('0800200c9a6611e19b21ff6f8cb0c57d'));