diff --git a/src/Sys.php b/src/Sys.php
index a4bd86d..80617ad 100644
--- a/src/Sys.php
+++ b/src/Sys.php
@@ -142,7 +142,7 @@ public static function isPhp($version, $current = PHP_VERSION)
      * @param string $current
      * @return bool
      */
-    public static function Php53($current = PHP_VERSION)
+    public static function isPhp53($current = PHP_VERSION)
     {
         return self::isPhp('5.3', $current);
     }
diff --git a/tests/SysTest.php b/tests/SysTest.php
index ebbd12f..8846ac6 100644
--- a/tests/SysTest.php
+++ b/tests/SysTest.php
@@ -69,14 +69,14 @@ public function testIsPHPVersion()
 
     public function testIsPHP53()
     {
-        isTrue(Sys::Php53('5.3'));
-        isTrue(Sys::Php53('5.3.0'));
-        isTrue(Sys::Php53('5.3.1'));
-
-        isFalse(Sys::Php53('5.2'));
-        isFalse(Sys::Php53('5.2.3'));
-        isFalse(Sys::Php53('5.4'));
-        isFalse(Sys::Php53('7.3'));
+        isTrue(Sys::isPhp53('5.3'));
+        isTrue(Sys::isPhp53('5.3.0'));
+        isTrue(Sys::isPhp53('5.3.1'));
+
+        isFalse(Sys::isPhp53('5.2'));
+        isFalse(Sys::isPhp53('5.2.3'));
+        isFalse(Sys::isPhp53('5.4'));
+        isFalse(Sys::isPhp53('7.3'));
     }
 
     public function testIsPHP7()