diff --git a/cake/libs/inflector.php b/cake/libs/inflector.php
index 65045f3c9..2f6d4140f 100644
--- a/cake/libs/inflector.php
+++ b/cake/libs/inflector.php
@@ -177,7 +177,7 @@ class Inflector extends Object {
 		}
 
 		if (preg_match('/(.*)\\b(' . $regexIrregular . ')$/i', $word, $regs)) {
-			$_this->pluralized[$word] = $regs[1] . $irregular[strtolower($regs[2])];
+			$_this->pluralized[$word] = $regs[1] . substr($word, 0, 1) . substr($irregular[strtolower($regs[2])], 1);
 			return $_this->pluralized[$word];
 		}
 
@@ -316,7 +316,7 @@ class Inflector extends Object {
 		}
 
 		if (preg_match('/(.*)\\b(' . $regexIrregular . ')$/i', $word, $regs)) {
-			$_this->singularized[$word] = $regs[1] . $irregular[strtolower($regs[2])];
+			$_this->singularized[$word] = $regs[1] . substr($word, 0, 1) . substr($irregular[strtolower($regs[2])], 1);
 			return $_this->singularized[$word];
 		}
 
diff --git a/cake/tests/cases/libs/inflector.test.php b/cake/tests/cases/libs/inflector.test.php
index 940b7a744..60978b3a0 100644
--- a/cake/tests/cases/libs/inflector.test.php
+++ b/cake/tests/cases/libs/inflector.test.php
@@ -45,6 +45,10 @@ class InflectorTest extends UnitTestCase {
 		$expected = 'menu';
 		$this->assertEqual($result, $expected);
 
+		$result = $this->inflector->singularize('Menus');
+		$expected = 'Menu';
+		$this->assertEqual($result, $expected);
+
 		$result = $this->inflector->singularize('houses');
 		$expected = 'house';
 		$this->assertEqual($result, $expected);
@@ -111,6 +115,10 @@ class InflectorTest extends UnitTestCase {
 		$expected = 'menus';
 		$this->assertEqual($result, $expected);
 
+		$result = $this->inflector->pluralize('Menu');
+		$expected = 'Menus';
+		$this->assertEqual($result, $expected);
+
 		$result = $this->inflector->pluralize('quiz');
 		$expected = 'quizzes';
 		$this->assertEqual($result, $expected);