diff --git a/src/Purl/Fragment.php b/src/Purl/Fragment.php
index 96706b0..e0665ee 100644
--- a/src/Purl/Fragment.php
+++ b/src/Purl/Fragment.php
@@ -109,6 +109,10 @@ public function __toString() : string
     protected function doInitialize() : void
     {
         if ($this->fragment !== null) {
+            $pos = strpos($this->fragment, ':', 1);
+            if ($pos !== false) {
+                $this->fragment = substr($this->fragment, 0, $pos);
+            }
             $data = parse_url($this->fragment);
             if ($data === false) {
                 $data = ['path' => $this->fragment];
diff --git a/tests/Purl/Test/UrlTest.php b/tests/Purl/Test/UrlTest.php
index 23ee2d0..212203a 100644
--- a/tests/Purl/Test/UrlTest.php
+++ b/tests/Purl/Test/UrlTest.php
@@ -365,7 +365,7 @@ public function testRelativeUrl() : void
 
         // test fragment with colon
         $url = new Url('http://example.com/#hello:123');
-        $this->assertEquals('http://example.com/', (string) $url);
+        $this->assertEquals('http://example.com/#hello', (string) $url);
     }
 }