diff --git a/src/array/primitive/mutable.rs b/src/array/primitive/mutable.rs
index ee330188126..f9b2f572a70 100644
--- a/src/array/primitive/mutable.rs
+++ b/src/array/primitive/mutable.rs
@@ -164,8 +164,8 @@ impl<T: NativeType> MutablePrimitiveArray<T> {
         if let Some(validity) = self.validity.as_mut() {
             extend_trusted_len_unzip(iterator, validity, &mut self.values)
         } else {
-            let mut validity =
-                MutableBitmap::from_trusted_len_iter(std::iter::repeat(true).take(self.len()));
+            let mut validity = MutableBitmap::new();
+            validity.extend_constant(self.len(), true);
             extend_trusted_len_unzip(iterator, &mut validity, &mut self.values);
             if validity.null_count() > 0 {
                 self.validity = Some(validity);
@@ -449,10 +449,10 @@ pub(crate) unsafe fn extend_trusted_len_unzip<I, P, T>(
     I: Iterator<Item = Option<P>>,
 {
     let (_, upper) = iterator.size_hint();
-    let len = upper.expect("trusted_len_unzip requires an upper limit");
+    let additional = upper.expect("trusted_len_unzip requires an upper limit");
 
-    validity.reserve(len);
-    buffer.reserve(len);
+    validity.reserve(additional);
+    buffer.reserve(additional);
 
     for item in iterator {
         let item = if let Some(item) = item {
diff --git a/src/bitmap/mutable.rs b/src/bitmap/mutable.rs
index d3eae6689e5..4826ef7872c 100644
--- a/src/bitmap/mutable.rs
+++ b/src/bitmap/mutable.rs
@@ -98,10 +98,8 @@ impl MutableBitmap {
         if self.length % 8 == 0 {
             self.buffer.push_unchecked(0);
         }
-        if value {
-            let byte = self.buffer.as_mut_slice().last_mut().unwrap();
-            *byte = set(*byte, self.length % 8, true);
-        };
+        let byte = self.buffer.as_mut_slice().last_mut().unwrap();
+        *byte = set(*byte, self.length % 8, value);
         self.length += 1;
     }