diff --git a/src/grid.rs b/src/grid.rs
index 7871ab1..8449c69 100644
--- a/src/grid.rs
+++ b/src/grid.rs
@@ -114,11 +114,14 @@ where
     // We mutate grid buffers and read grid data. We use unsafe because we need shared/unique borrows on different fields of the same Grid struct.
     bufs.iter().enumerate().for_each(|(i, buf)| {
         let buf_ptr = *buf as *const Vec<f32> as *mut Vec<f32>;
-        unsafe { buf_ptr.as_mut() }.unwrap().fill(0.0);
+        // SAFETY! we can take these are raw pointers because we are
+        // getting it from a `&mut [Grid]`
+        let buf_ptr_mut = unsafe { buf_ptr.as_mut().unwrap_unchecked() };
+
+        buf_ptr_mut.fill(0.0);
         datas.iter().enumerate().for_each(|(j, other)| {
             let multiplier = attraction_table[i].as_ref()[j];
-            unsafe { buf_ptr.as_mut() }
-                .unwrap()
+            buf_ptr_mut
                 .iter_mut()
                 .zip(*other)
                 .for_each(|(to, from)| *to += from * multiplier)