diff --git a/roaring/src/bitmap/iter.rs b/roaring/src/bitmap/iter.rs
index b6e16f81..23c9f37e 100644
--- a/roaring/src/bitmap/iter.rs
+++ b/roaring/src/bitmap/iter.rs
@@ -732,6 +732,7 @@ impl Extend<u32> for RoaringBitmap {
     /// assert!(rb.contains(1508));
     /// assert!(!rb.contains(5));
     /// ```
+    #[inline]
     fn extend<I: IntoIterator<Item = u32>>(&mut self, values: I) {
         let mut values = values.into_iter();
         let value = match values.next() {
@@ -742,18 +743,18 @@ impl Extend<u32> for RoaringBitmap {
         let (mut currenthb, lowbit) = util::split(value);
         let mut current_container_index = self.find_container_by_key(currenthb);
         let mut current_cont = &mut self.containers[current_container_index];
-        current_cont.insert(lowbit) as u64;
+        current_cont.insert(lowbit);
 
         for val in values {
             let (newhb, lowbit) = util::split(val);
             if currenthb == newhb {
                 // easy case, this could be quite frequent
-                current_cont.insert(lowbit) as u64;
+                current_cont.insert(lowbit);
             } else {
                 currenthb = newhb;
                 current_container_index = self.find_container_by_key(currenthb);
                 current_cont = &mut self.containers[current_container_index];
-                current_cont.insert(lowbit) as u64;
+                current_cont.insert(lowbit);
             }
         }
     }
@@ -777,6 +778,7 @@ impl<'a> Extend<&'a u32> for RoaringBitmap {
     /// assert!(rb.contains(1508));
     /// assert!(!rb.contains(5));
     /// ```
+    #[inline]
     fn extend<I: IntoIterator<Item = &'a u32>>(&mut self, values: I) {
         self.extend(values.into_iter().copied());
     }
diff --git a/roaring/src/bitmap/store/bitmap_store.rs b/roaring/src/bitmap/store/bitmap_store.rs
index cf4649c1..aec2404a 100644
--- a/roaring/src/bitmap/store/bitmap_store.rs
+++ b/roaring/src/bitmap/store/bitmap_store.rs
@@ -102,7 +102,7 @@ impl BitmapStore {
     pub fn insert(&mut self, index: u16) -> bool {
         let (key, bit) = (key(index), bit(index));
         let old_w = self.bits[key];
-        let new_w = old_w | 1 << bit;
+        let new_w = old_w | (1 << bit);
         let inserted = (old_w ^ new_w) >> bit; // 1 or 0
         self.bits[key] = new_w;
         self.len += inserted;
@@ -634,7 +634,7 @@ impl BitOrAssign<&ArrayStore> for BitmapStore {
         for &index in rhs.iter() {
             let (key, bit) = (key(index), bit(index));
             let old_w = self.bits[key];
-            let new_w = old_w | 1 << bit;
+            let new_w = old_w | (1 << bit);
             self.len += (old_w ^ new_w) >> bit;
             self.bits[key] = new_w;
         }
@@ -679,7 +679,7 @@ impl BitXorAssign<&ArrayStore> for BitmapStore {
         for &index in rhs.iter() {
             let (key, bit) = (key(index), bit(index));
             let old_w = self.bits[key];
-            let new_w = old_w ^ 1 << bit;
+            let new_w = old_w ^ (1 << bit);
             len += 1 - 2 * (((1 << bit) & old_w) >> bit) as i64; // +1 or -1
             self.bits[key] = new_w;
         }
diff --git a/roaring/src/treemap/inherent.rs b/roaring/src/treemap/inherent.rs
index 9db01ebf..63e2cb3b 100644
--- a/roaring/src/treemap/inherent.rs
+++ b/roaring/src/treemap/inherent.rs
@@ -409,7 +409,7 @@ impl RoaringTreemap {
         for (&key, bitmap) in &self.map {
             let len = bitmap.len();
             if len > n {
-                return Some((key as u64) << 32 | bitmap.select(n as u32).unwrap() as u64);
+                return Some(((key as u64) << 32) | bitmap.select(n as u32).unwrap() as u64);
             }
             n -= len;
         }