diff --git a/src/main.rs b/src/main.rs
index 0208f17..8562b1b 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -172,7 +172,7 @@ impl SField {
         // safety:
         //     self.possible_vals is initialized with self.size * self.size
         //     so self.pos can safely be used to index here
-        let possible_vals = unsafe { self.possible_values.get_unchecked(self.pos) };
+        let possible_vals = &self.possible_values[self.pos];
 
         for nr in possible_vals.iter() {
             if *nr <= current_nr {
@@ -246,7 +246,7 @@ impl SField {
     }
 
     fn next(&mut self) -> bool {
-        let new_pos = self.pos + 1 + unsafe { *self.skipf.get_unchecked(self.pos + 1) as usize };
+        let new_pos = self.pos + 1 + self.skipf[self.pos + 1] as usize;
 
         if new_pos >= NUM_FIELDS {
             return false;
@@ -257,7 +257,7 @@ impl SField {
     }
 
     fn prev(&mut self) -> bool {
-        let new_pos = self.pos - 1 - unsafe { *self.skipb.get_unchecked(self.pos) as usize };
+        let new_pos = self.pos - 1 - self.skipb[self.pos] as usize;
 
         if new_pos >= NUM_FIELDS {
             return false;