diff --git a/client.go b/client.go
index 23cb5e0..327f66a 100644
--- a/client.go
+++ b/client.go
@@ -217,7 +217,7 @@ func (c *Client) AssignAgent(ctx context.Context, userID, agentID int64) error {
 		return err
 	}
 
-	_, err = c.do(ctx, http.MethodPost, "/agent_assignments", bytes.NewReader(body))
+	_, err = c.do(ctx, http.MethodPost, "/agent_assignments", body)
 	if err != nil {
 		return err
 	}