diff --git a/lib/forecast.io.php b/lib/forecast.io.php
index 34116d6..9d74e74 100644
--- a/lib/forecast.io.php
+++ b/lib/forecast.io.php
@@ -31,8 +31,8 @@ private function requestData($latitude, $longitude, $units, $timestamp = false,
       $request_url = self::API_ENDPOINT .
         $this->api_key . '/' .
         $latitude . ',' . $longitude .
-        '?units=' . $units .
         ( $timestamp ? ',' . $timestamp : '' ) . 
+        '?units=' . $units .
         ( $exclusions ? '&exclude=' . $exclusions : '' );
 
       $content = file_get_contents($request_url);
@@ -91,7 +91,7 @@ function getHistoricalConditions($latitude, $longitude, $units = 'auto', $timest
 
     $exclusions = 'currently,minutely,hourly,alerts,flags';
 
-    $data = $this->requestData($latitude, $longitude, $units $timestamp, $exclusions);
+    $data = $this->requestData($latitude, $longitude, $units, $timestamp, $exclusions);
 
     if ($data !== false) {
 
@@ -418,4 +418,4 @@ function getSunset($format=null) {
   }
   
 }
-?>
\ No newline at end of file
+?>