diff --git a/src/grouping_map.rs b/src/grouping_map.rs
index 33ae065d2..0dea42499 100644
--- a/src/grouping_map.rs
+++ b/src/grouping_map.rs
@@ -27,12 +27,10 @@ impl<V, K, F: FnMut(&V) -> K> MapSpecialCaseFn<V> for GroupingMapFn<F> {
     }
 }
 
-impl<K, I: Iterator, F: FnMut(&I::Item) -> K> MapForGrouping<I, F> {
-    pub(crate) fn new(iter: I, key_mapper: F) -> Self {
-        MapSpecialCase {
-            iter,
-            f: GroupingMapFn(key_mapper),
-        }
+pub(crate) fn new_map_for_grouping<K, I: Iterator, F: FnMut(&I::Item) ->K>(iter: I, key_mapper: F) -> MapForGrouping<I, F> {
+    MapSpecialCase {
+        iter,
+        f: GroupingMapFn(key_mapper),
     }
 }
 
diff --git a/src/lib.rs b/src/lib.rs
index 218b3a8b9..b7973248d 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -3194,7 +3194,7 @@ pub trait Itertools: Iterator {
         K: Hash + Eq,
         F: FnMut(&V) -> K,
     {
-        grouping_map::new(grouping_map::MapForGrouping::new(self, key_mapper))
+        grouping_map::new(grouping_map::new_map_for_grouping(self, key_mapper))
     }
 
     /// Return all minimum elements of an iterator.