diff --git a/Sources/Leaf/LeafEncoder.swift b/Sources/Leaf/LeafEncoder.swift
index 2584769..343ffb4 100644
--- a/Sources/Leaf/LeafEncoder.swift
+++ b/Sources/Leaf/LeafEncoder.swift
@@ -136,7 +136,7 @@ extension LeafEncoder {
     }
 
     private final class KeyedContainerImpl<Key>: KeyedEncodingContainerProtocol, LeafEncodingResolvable where Key: CodingKey {
-        private let encoder: EncoderImpl
+        private weak var encoder: EncoderImpl!
         private var data: [String: LeafEncodingResolvable] = [:]
         
         /// See ``LeafEncodingResolvable/resolvedData``.
@@ -197,7 +197,7 @@ extension LeafEncoder {
     }
     
     private final class UnkeyedContainerImpl: UnkeyedEncodingContainer, LeafEncodingResolvable {
-        private let encoder: EncoderImpl
+        private weak var encoder: EncoderImpl!
         private var data: [LeafEncodingResolvable] = []
         
         /// See ``LeafEncodingResolvable/resolvedData``.