diff --git a/concrete-optimizer/src/optimization/dag/solo_key/optimize.rs b/concrete-optimizer/src/optimization/dag/solo_key/optimize.rs
index 4c6882bb6..2abaa539f 100644
--- a/concrete-optimizer/src/optimization/dag/solo_key/optimize.rs
+++ b/concrete-optimizer/src/optimization/dag/solo_key/optimize.rs
@@ -439,6 +439,9 @@ mod tests {
             complexity_model: &CpuComplexity::default(),
         };
 
+        let _ = optimize_v0(sum_size, precision, config, weight as f64, &search_space);
+        // ensure cache is filled
+
         let chrono = Instant::now();
         let state = optimize_v0(sum_size, precision, config, weight as f64, &search_space);