diff --git a/phf/src/map.rs b/phf/src/map.rs
index 002590a6..e7d990ef 100644
--- a/phf/src/map.rs
+++ b/phf/src/map.rs
@@ -146,7 +146,7 @@ impl<'a, K, V> DoubleEndedIterator<&'a (K, V)> for Entries<'a, K, V> {
     }
 }
 
-impl<'a, K, V> ExactSize<&'a (K, V)> for Entries<'a, K, V> {}
+impl<'a, K, V> ExactSizeIterator<&'a (K, V)> for Entries<'a, K, V> {}
 
 /// An iterator over the keys in a `Map`.
 pub struct Keys<'a, K:'a, V:'a> {
@@ -169,7 +169,7 @@ impl<'a, K, V> DoubleEndedIterator<&'a K> for Keys<'a, K, V> {
     }
 }
 
-impl<'a, K, V> ExactSize<&'a K> for Keys<'a, K, V> {}
+impl<'a, K, V> ExactSizeIterator<&'a K> for Keys<'a, K, V> {}
 
 /// An iterator over the values in a `Map`.
 pub struct Values<'a, K:'a, V:'a> {
@@ -192,4 +192,4 @@ impl<'a, K, V> DoubleEndedIterator<&'a V> for Values<'a, K, V> {
     }
 }
 
-impl<'a, K, V> ExactSize<&'a V> for Values<'a, K, V> {}
+impl<'a, K, V> ExactSizeIterator<&'a V> for Values<'a, K, V> {}
diff --git a/phf/src/ordered_map.rs b/phf/src/ordered_map.rs
index 9d64e4b9..01ab8a62 100644
--- a/phf/src/ordered_map.rs
+++ b/phf/src/ordered_map.rs
@@ -175,7 +175,7 @@ impl<'a, K, V> RandomAccessIterator<&'a (K, V)> for Entries<'a, K, V> {
     }
 }
 
-impl<'a, K, V> ExactSize<&'a (K, V)> for Entries<'a, K, V> {}
+impl<'a, K, V> ExactSizeIterator<&'a (K, V)> for Entries<'a, K, V> {}
 
 /// An iterator over the keys in a `OrderedMap`.
 pub struct Keys<'a, K:'a, V:'a> {
@@ -208,7 +208,7 @@ impl<'a, K, V> RandomAccessIterator<&'a K> for Keys<'a, K, V> {
     }
 }
 
-impl<'a, K, V> ExactSize<&'a K> for Keys<'a, K, V> {}
+impl<'a, K, V> ExactSizeIterator<&'a K> for Keys<'a, K, V> {}
 
 /// An iterator over the values in a `OrderedMap`.
 pub struct Values<'a, K:'a, V:'a> {
@@ -241,4 +241,4 @@ impl<'a, K, V> RandomAccessIterator<&'a V> for Values<'a, K, V> {
     }
 }
 
-impl<'a, K, V> ExactSize<&'a V> for Values<'a, K, V> {}
+impl<'a, K, V> ExactSizeIterator<&'a V> for Values<'a, K, V> {}
diff --git a/phf/src/ordered_set.rs b/phf/src/ordered_set.rs
index 98ee9e00..06dddf9b 100644
--- a/phf/src/ordered_set.rs
+++ b/phf/src/ordered_set.rs
@@ -146,5 +146,5 @@ impl<'a, T> RandomAccessIterator<&'a T> for Entries<'a, T> {
     }
 }
 
-impl<'a, T> ExactSize<&'a T> for Entries<'a, T> {}
+impl<'a, T> ExactSizeIterator<&'a T> for Entries<'a, T> {}
 
diff --git a/phf/src/set.rs b/phf/src/set.rs
index 64c2dfd4..1e25a659 100644
--- a/phf/src/set.rs
+++ b/phf/src/set.rs
@@ -120,6 +120,6 @@ impl<'a, T> DoubleEndedIterator<&'a T> for Items<'a, T> {
     }
 }
 
-impl<'a, T> ExactSize<&'a T> for Items<'a, T> {}
+impl<'a, T> ExactSizeIterator<&'a T> for Items<'a, T> {}