diff --git a/vortex-roaring/src/boolean/compress.rs b/vortex-roaring/src/boolean/compress.rs
index de2d8b334a..87c76f62e9 100644
--- a/vortex-roaring/src/boolean/compress.rs
+++ b/vortex-roaring/src/boolean/compress.rs
@@ -48,6 +48,7 @@ pub fn roaring_encode(bool_array: &BoolArray) -> RoaringBoolArray {
             .map(|(i, _)| i as u32),
     );
     bitmap.run_optimize();
+    bitmap.shrink_to_fit();
 
     RoaringBoolArray::new(bitmap, bool_array.buffer().len())
 }
diff --git a/vortex-roaring/src/integer/compress.rs b/vortex-roaring/src/integer/compress.rs
index 01f28a07e3..2104108dd7 100644
--- a/vortex-roaring/src/integer/compress.rs
+++ b/vortex-roaring/src/integer/compress.rs
@@ -73,5 +73,6 @@ fn roaring_encode_primitive<T: NumCast + NativePType>(values: &[T]) -> RoaringIn
     let mut bitmap = Bitmap::new();
     bitmap.extend(values.iter().map(|i| i.to_u32().unwrap()));
     bitmap.run_optimize();
+    bitmap.shrink_to_fit();
     RoaringIntArray::new(bitmap, T::PTYPE)
 }