diff --git a/src/dapi/RestrictedDataApi.js b/src/dapi/RestrictedDataApi.js
index 73b8440..d4758cf 100644
--- a/src/dapi/RestrictedDataApi.js
+++ b/src/dapi/RestrictedDataApi.js
@@ -126,7 +126,7 @@ module.exports = Class( 'RestrictedDataApi' )
             // fail on unknown params
             if ( !( this._params[ name ] ) )
             {
-                throw Error( 'Unkown param: ' + name );
+                throw Error( 'Unknown param: ' + name );
             }
         }