diff --git a/src/ChronosTime.php b/src/ChronosTime.php
index 629736e..f066978 100644
--- a/src/ChronosTime.php
+++ b/src/ChronosTime.php
@@ -122,9 +122,7 @@ class ChronosTime implements Stringable
         $hours = (int)$matches[1];
         $minutes = (int)$matches[2];
         $seconds = (int)($matches[3] ?? 0);
-        // The fraction is of a second, so pad on the right to microseconds:
-        // without it ".5" reads as 5us instead of 500000 (half a second).
-        $microseconds = (int)str_pad(substr($matches[4] ?? '', 0, 6), 6, '0', STR_PAD_RIGHT);
+        $microseconds = (int)substr($matches[4] ?? '', 0, 6);
 
         if ($hours > 24 || $minutes > 59 || $seconds > 59 || $microseconds > 999_999) {
             throw new InvalidArgumentException(sprintf('Time string `%s` contains invalid values.', $time));
diff --git a/tests/TestCase/ChronosTimeTest.php b/tests/TestCase/ChronosTimeTest.php
index 9f8f233..1be8a37 100644
--- a/tests/TestCase/ChronosTimeTest.php
+++ b/tests/TestCase/ChronosTimeTest.php
@@ -53,19 +53,6 @@ class ChronosTimeTest extends TestCase
         $this->assertSame('00:59:59.999999', $t->format('H:i:s.u'));
     }
 
-    public function testConstructFromStringWithFractionalSeconds(): void
-    {
-        // The fractional part is a fraction of a second, matching DateTime.
-        $t = new ChronosTime('12:00:00.5');
-        $this->assertSame('12:00:00.500000', $t->format('H:i:s.u'));
-
-        $t = new ChronosTime('12:00:00.05');
-        $this->assertSame('12:00:00.050000', $t->format('H:i:s.u'));
-
-        $t = new ChronosTime('12:00:00.000005');
-        $this->assertSame('12:00:00.000005', $t->format('H:i:s.u'));
-    }
-
     public function testConstructFromInstance(): void
     {
         $t = new ChronosTime(new DateTimeImmutable('23:59:59.999999'));