diff --git a/lib/main.js b/lib/main.js
index 40d7310..a221e52 100644
--- a/lib/main.js
+++ b/lib/main.js
@@ -49,7 +49,7 @@ function format( str ) {
 	var i;
 
 	if ( !isString( str ) ) {
-		throw new TypeError( format( 'invalid argument. First argument must be a string. Value: `%s`.', str ) );
+		throw new TypeError( format( '1Of3F', str ) );
 	}
 	args = [ tokenize( str ) ];
 	for ( i = 1; i < arguments.length; i++ ) {