diff --git a/src/function_manager.rs b/src/function_manager.rs
index b7a0b0e..e839c9d 100644
--- a/src/function_manager.rs
+++ b/src/function_manager.rs
@@ -18,7 +18,7 @@ pub struct FunctionManager {
 impl Default for FunctionManager {
     fn default() -> Self {
         let mut d = Self {
-            ..Default::default()
+            functions: Vec::new()
         };
         d.push_empty();
         d