diff --git a/src/header/map.rs b/src/header/map.rs
index e9ee7cab..5407b77f 100644
--- a/src/header/map.rs
+++ b/src/header/map.rs
@@ -1735,14 +1735,6 @@ impl<K, V, S> IntoHeaderMapAllowed for HashMap<K, V, S> {}
 
 impl<'a, K, V, S> IntoHeaderMapAllowed for &'a HashMap<K, V, S> {}
 
-impl<K, V> IntoHeaderMapAllowed for BTreeMap<K, V> {}
-
-impl<'a, K, V> IntoHeaderMapAllowed for &'a BTreeMap<K, V> {}
-
-impl<'a, T> IntoHeaderMapAllowed for &'a [T] {}
-
-impl<T> IntoHeaderMapAllowed for Vec<T> {}
-
 /// Convert a collection of tuples into a HeaderMap
 ///
 /// # Examples