diff --git a/app-proto/src/engine.rs b/app-proto/src/engine.rs
index 57243b8..1c32417 100644
--- a/app-proto/src/engine.rs
+++ b/app-proto/src/engine.rs
@@ -639,11 +639,11 @@ mod tests {
     
     #[test]
     fn tangent_test_kaleidocycle() {
-        const SCALED_TOL: f64 = 1.0e-12;
         // set up a kaleidocycle, made of points with fixed distances between
         // them, and find its tangent space
         const N_POINTS: usize = 12;
         const N_HINGES: usize = 6;
+        const SCALED_TOL: f64 = 1.0e-12;
         let gram = {
             let mut gram_to_be = PartialMatrix::new();
             for block in (0..N_POINTS).step_by(2) {