diff --git a/Parle/Parser.php b/Parle/Parser.php
index 99ae0aa9..2b953b57 100644
--- a/Parle/Parser.php
+++ b/Parle/Parser.php
@@ -22,7 +22,7 @@ class Parser
     public const ACTION_ACCEPT = 4;
     public const ERROR_SYNTAX = 0;
     public const ERROR_NON_ASSOCIATIVE = 1;
-    public const ERROR_UNKOWN_TOKEN = 2;
+    public const ERROR_UNKNOWN_TOKEN = 2;
 
     /* Properties */
     /**
diff --git a/Parle/RParser.php b/Parle/RParser.php
index bdb73051..dbda9bad 100644
--- a/Parle/RParser.php
+++ b/Parle/RParser.php
@@ -14,7 +14,7 @@ class RParser
     public const ACTION_ACCEPT = 4;
     public const ERROR_SYNTAX = 0;
     public const ERROR_NON_ASSOCIATIVE = 1;
-    public const ERROR_UNKOWN_TOKEN = 2;
+    public const ERROR_UNKNOWN_TOKEN = 2;
 
     /* Properties */
     /**