diff --git a/posts/2015-11-15-allocating-frames.md b/posts/2015-11-15-allocating-frames.md
index 49ffc2f1..1e285443 100644
--- a/posts/2015-11-15-allocating-frames.md
+++ b/posts/2015-11-15-allocating-frames.md
@@ -301,7 +301,7 @@ fn choose_next_area(&mut self) {
     self.current_area = self.areas.clone().filter(|area| {
         let address = area.base_addr + area.length - 1;
         Frame::containing_address(address as usize) >= self.next_free_frame
-    }).min_by(|area| area.base_addr);
+    }).min_by_key(|area| area.base_addr);
 
     if let Some(area) = self.current_area {
         let start_frame = Frame::containing_address(area.base_addr as usize);
@@ -311,9 +311,9 @@ fn choose_next_area(&mut self) {
     }
 }
 ```
-This function chooses the area with the minimal base address that still has free frames, i.e. `next_free_frame` is smaller than its last frame. Note that we need to clone the iterator because the [min_by] function consumes it. If there are no areas with free frames left, `min_by` automatically returns the desired `None`.
+This function chooses the area with the minimal base address that still has free frames, i.e. `next_free_frame` is smaller than its last frame. Note that we need to clone the iterator because the [min_by_key] function consumes it. If there are no areas with free frames left, `min_by_key` automatically returns the desired `None`.
 
-[min_by]: https://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.min_by
+[min_by_key]: https://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.min_by_key
 
 If the `next_free_frame` is below the new `current_area`, it needs to be updated to the area's start frame. Else, the `allocate_frame` call could return an unavailable frame.
 
diff --git a/src/memory/area_frame_allocator.rs b/src/memory/area_frame_allocator.rs
index 86563e63..99dbadc7 100644
--- a/src/memory/area_frame_allocator.rs
+++ b/src/memory/area_frame_allocator.rs
@@ -37,7 +37,7 @@ impl AreaFrameAllocator {
         self.current_area = self.areas.clone().filter(|area| {
             let address = area.base_addr + area.length - 1;
             Frame::containing_address(address as usize) >= self.next_free_frame
-        }).min_by(|area| area.base_addr);
+        }).min_by_key(|area| area.base_addr);
 
         if let Some(area) = self.current_area {
             let start_frame = Frame::containing_address(area.base_addr as usize);