diff --git a/Simplex/Fraction.php b/Simplex/Fraction.php
index acf503b..7240077 100644
--- a/Simplex/Fraction.php
+++ b/Simplex/Fraction.php
@@ -70,7 +70,7 @@ public function getDenominator()
 	public function canonicalize()
 	{
 		if ($this->d === '0') {
-			throw new \Exception('Division by zero.');
+			throw new DivisionByZeroException('Division by zero.');
 		}
 
 		$gcd = Helpers::gcd($this->n, $this->d);
diff --git a/Simplex/exceptions.php b/Simplex/exceptions.php
new file mode 100644
index 0000000..034f5eb
--- /dev/null
+++ b/Simplex/exceptions.php
@@ -0,0 +1,16 @@
+<?php
+
+/**
+ * This file is part of the SimplexCalculator library
+ *
+ * Copyright (c) 2014 Petr Kessler (https://kesspess.cz)
+ *
+ * @license  MIT
+ * @link     https://github.com/uestla/Simplex-Calculator
+ */
+
+namespace Simplex;
+
+
+final class DivisionByZeroException extends \Exception
+{}
diff --git a/Simplex/simplex.php b/Simplex/simplex.php
index bf7d2fe..da09328 100644
--- a/Simplex/simplex.php
+++ b/Simplex/simplex.php
@@ -1,5 +1,6 @@
 <?php
 
+require_once __DIR__ . '/exceptions.php';
 require_once __DIR__ . '/Math.php';
 require_once __DIR__ . '/Helpers.php';
 require_once __DIR__ . '/Fraction.php';
diff --git a/tests/FractionTest.phpt b/tests/FractionTest.phpt
index 8c22261..2e5a88b 100644
--- a/tests/FractionTest.phpt
+++ b/tests/FractionTest.phpt
@@ -31,7 +31,7 @@ final class FractionTest extends TestCase
 		Assert::exception(function () {
 			new Fraction(3, 0);
 
-		}, 'Exception', 'Division by zero.');
+		}, 'Simplex\\DivisionByZeroException', 'Division by zero.');
 	}