diff --git a/crates/ml/build.rs b/crates/ml/build.rs
index 3870f7bb2..57b88f195 100644
--- a/crates/ml/build.rs
+++ b/crates/ml/build.rs
@@ -36,7 +36,12 @@ fn main() {
     println!("cargo:rerun-if-changed={}", trade_physics_header.display());
     println!("cargo:rerun-if-changed={}", sp4_histogram_p99_header.display());
 
-    // Detect GPU architecture from env or default to sm_80
+    // Detect GPU architecture from env or default to sm_80.
+    // `rerun-if-env-changed` is mandatory: the cargo-target PVC is shared
+    // across H100 (sm_90) and L40S (sm_89) jobs, and without this trigger
+    // cargo serves stale cubins compiled for the previous arch on every
+    // subsequent build, producing CUDA_ERROR_NO_BINARY_FOR_GPU at runtime.
+    println!("cargo:rerun-if-env-changed=CUDA_COMPUTE_CAP");
     let cuda_compute_cap = std::env::var("CUDA_COMPUTE_CAP").unwrap_or_else(|_| "80".to_string());
     let arch = format!("sm_{cuda_compute_cap}");