diff --git a/fixed_wide/src/fixed_wide_traits.rs b/fixed_wide/src/fixed_wide_traits.rs
index 9d6ab27..bd9ac24 100644
--- a/fixed_wide/src/fixed_wide_traits.rs
+++ b/fixed_wide/src/fixed_wide_traits.rs
@@ -69,7 +69,8 @@ impl<const CHUNKS:usize,Frac:Unsigned> Fixed<CHUNKS,Frac>
 		//sqrt
 		//0110.0000
 		//pow2 = 0100.0000
-		let max_shift=((((CHUNKS as i32*64-Frac::I32-(self.bits.leading_zeros() as i32)+1)>>1)+Frac::I32) as u32).saturating_sub(1);
+		let used_bits=CHUNKS as i32*64-1-Frac::I32-self.bits.leading_zeros() as i32;
+		let max_shift=((used_bits>>1)+Frac::I32) as u32;
 		let mut result=Self::ZERO;
 
 		//cheat to make the types match