1 files changed, 3 insertions, 3 deletions
diff --git a/src/buildable.rs b/src/buildable.rs
index 54e7bbe..0436456 100644
--- a/src/buildable.rs
+++ b/src/buildable.rs
@@ -147,14 +147,14 @@ impl BuildableValue for String {
 
 pub trait BuildableCollection {
     fn builder<B>(backend: B) -> Box<dyn CollectionBuilder<Output = Self>>
-        where B: Backend;
+        where B: 'static + Backend;
 }
 
 impl<T> BuildableCollection for Vec<T>
     where T: 'static + BuildableValue,
 {
     fn builder<B>(backend: B) -> Box<dyn CollectionBuilder<Output = Self>>
-        where B: Backend
+        where B: 'static + Backend
     {
         backend.vec_builder::<T>()
     }
@@ -164,7 +164,7 @@ impl<T> BuildableCollection for Option<T>
     where T: 'static + BuildableValue + Sized,
 {
     fn builder<B>(backend: B) -> Box<dyn CollectionBuilder<Output = Option<T>>>
-        where B: Backend
+        where B: 'static + Backend
     {
         backend.option_builder()
     }