diff --git a/cake/libs/inflector.php b/cake/libs/inflector.php
index 4012b1a8d48..73a73960e97 100644
--- a/cake/libs/inflector.php
+++ b/cake/libs/inflector.php
@@ -298,7 +298,7 @@ function __initSingularRules() {
 			'/(drive)s$/i' => '\1',
 			'/([^fo])ves$/i' => '\1fe',
 			'/(^analy)ses$/i' => '\1sis',
-			'/((a)naly|(b)a|(d)iagno|(p)arenthe|(p)rogno|(s)ynop|(t)he)ses$/i' => '\1\2sis',
+			'/(analy|(b)a|(d)iagno|(p)arenthe|(p)rogno|(s)ynop|(t)he)ses$/i' => '\1\2sis',
 			'/([ti])a$/i' => '\1um',
 			'/(p)eople$/i' => '\1\2erson',
 			'/(m)en$/i' => '\1an',
diff --git a/cake/tests/cases/libs/inflector.test.php b/cake/tests/cases/libs/inflector.test.php
index b896805a35d..7fd758213dd 100644
--- a/cake/tests/cases/libs/inflector.test.php
+++ b/cake/tests/cases/libs/inflector.test.php
@@ -109,6 +109,10 @@ function testInflectingSingulars() {
 		$this->assertEqual(Inflector::singularize('waxes'), 'wax');
 		$this->assertEqual(Inflector::singularize('waves'), 'wave');
 		$this->assertEqual(Inflector::singularize('bureaus'), 'bureau');
+		$this->assertEqual(Inflector::singularize('genetic_analyses'), 'genetic_analysis');
+		$this->assertEqual(Inflector::singularize('doctor_diagnoses'), 'doctor_diagnosis');
+		$this->assertEqual(Inflector::singularize('parantheses'), 'paranthesis');
+
 		$this->assertEqual(Inflector::singularize(''), '');
 	}
 /**