diff --git a/src/lib.rs b/src/lib.rs
index 69650c1..86b123c 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -108,13 +108,14 @@ impl core::iter::Iterator for KeySetIter {
     type Item = u8;
 
     fn next(&mut self) -> Option<Self::Item> {
-        let next_shift = self.key_set.0.trailing_zeros() as u8 + 1;
+        let next_shift = self.key_set.0.trailing_zeros() as u8;
         if next_shift >= 128 {
             return None;
         }
 
         self.key_set.0 >>= next_shift;
-        self.shift += next_shift;
+        self.key_set.0 >>= 1;
+        self.shift += next_shift + 1;
 
         Some(self.shift - 1)
     }