diff --git a/Escaper.php b/Escaper.php
index 3487a6ac..7bac8dde 100644
--- a/Escaper.php
+++ b/Escaper.php
@@ -33,13 +33,13 @@ class Escaper
                                      "\x08",  "\x09",  "\x0a",  "\x0b",  "\x0c",  "\x0d",  "\x0e",  "\x0f",
                                      "\x10",  "\x11",  "\x12",  "\x13",  "\x14",  "\x15",  "\x16",  "\x17",
                                      "\x18",  "\x19",  "\x1a",  "\x1b",  "\x1c",  "\x1d",  "\x1e",  "\x1f",
-                                     "\xc2\x85", "\xc2\xa0", "\xe2\x80\xa8", "\xe2\x80\xa9",);
+                                     "\xc2\x85", "\xc2\xa0", "\xe2\x80\xa8", "\xe2\x80\xa9");
     private static $escaped = array('\\\\', '\\"', '\\\\', '\\"',
                                      '\\0',   '\\x01', '\\x02', '\\x03', '\\x04', '\\x05', '\\x06', '\\a',
                                      '\\b',   '\\t',   '\\n',   '\\v',   '\\f',   '\\r',   '\\x0e', '\\x0f',
                                      '\\x10', '\\x11', '\\x12', '\\x13', '\\x14', '\\x15', '\\x16', '\\x17',
                                      '\\x18', '\\x19', '\\x1a', '\\e',   '\\x1c', '\\x1d', '\\x1e', '\\x1f',
-                                     '\\N', '\\_', '\\L', '\\P',);
+                                     '\\N', '\\_', '\\L', '\\P');
 
     /**
      * Determines if a PHP value would require double quoting in YAML.
diff --git a/Unescaper.php b/Unescaper.php
index 62ffdc3d..6e4f1d76 100644
--- a/Unescaper.php
+++ b/Unescaper.php
@@ -26,7 +26,7 @@ class Unescaper
     /**
      * Regex fragment that matches an escaped character in a double quoted string.
      */
-    const REGEX_ESCAPED_CHARACTER = "\\\\(x[0-9a-fA-F]{2}|u[0-9a-fA-F]{4}|U[0-9a-fA-F]{8}|.)";
+    const REGEX_ESCAPED_CHARACTER = '\\\\(x[0-9a-fA-F]{2}|u[0-9a-fA-F]{4}|U[0-9a-fA-F]{8}|.)';
 
     /**
      * Unescapes a single quoted string.