diff --git a/CHANGELOG b/CHANGELOG
index 782403a..affd47c 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -3,6 +3,9 @@ codebird-php - changelog
 
 2.5.0 (not yet released)
 
+2.4.1 (not yet released)
++ #26 Stringify null and boolean parameters
+
 2.4.0 (2013-06-15)
 + Add contributing guidelines
 + rfe #21 JSON return format
diff --git a/src/codebird.php b/src/codebird.php
index 47e97dc..e7d9987 100644
--- a/src/codebird.php
+++ b/src/codebird.php
@@ -217,6 +217,19 @@ public function __call($fn, $params)
                 }
             }
         }
+
+        // stringify null and boolean parameters
+        foreach ($apiparams as $key => $value) {
+            if (! is_scalar($value)) {
+                continue;
+            }
+            if (is_null($value)) {
+                $apiparams[$key] = 'null';
+            } elseif (is_bool($value)) {
+                $apiparams[$key] = $value ? 'true' : 'false';
+            }
+        }
+
         $app_only_auth = false;
         if (count($params) > 1) {
             $app_only_auth = !! $params[1];