diff --git a/src/with_alloc/alloc_ringbuffer.rs b/src/with_alloc/alloc_ringbuffer.rs
index 0c38b59..da0f35b 100644
--- a/src/with_alloc/alloc_ringbuffer.rs
+++ b/src/with_alloc/alloc_ringbuffer.rs
@@ -301,7 +301,7 @@ unsafe impl<T> RingBuffer<T> for AllocRingBuffer<T> {
     {
         let normalized_index = self.readptr + range.start.rem_euclid(self.len());
         let index = normalized_index % self.buffer_size();
-        let buf = unsafe { slice::from_raw_parts(self.buf, self.buffer_size()) };
+        let buf = unsafe { slice::from_raw_parts(self.buf, self.capacity()) };
         buf[index..]
             .iter()
             .chain(buf[..index].iter())
diff --git a/src/with_const_generics.rs b/src/with_const_generics.rs
index 3025d93..87c8afb 100644
--- a/src/with_const_generics.rs
+++ b/src/with_const_generics.rs
@@ -328,7 +328,7 @@ unsafe impl<T, const CAP: usize> RingBuffer<T> for ConstGenericRingBuffer<T, CAP
         T: 'a,
     {
         let normalized_index = self.readptr + range.start.rem_euclid(self.len());
-        let index = normalized_index % self.buffer_size();
+        let index = normalized_index % self.capacity();
         self.buf[index..]
             .iter()
             .chain(self.buf[..index].iter())