diff --git a/src/nodes/mod.rs b/src/nodes/mod.rs
index f435db4..da7c34e 100644
--- a/src/nodes/mod.rs
+++ b/src/nodes/mod.rs
@@ -25,7 +25,7 @@ pub fn eval(s: &str) -> Result<rug::Float, Error> {
     Ok(Nodes::from_str(s)?.evaluate()?)
 }
 
-pub const PREC: u32 = 512;
+pub const PREC: u32 = 2048;
 
 #[derive(Debug, Default, Clone, PartialEq)]
 pub struct Nodes(Vec<Node>);