diff --git a/methods/build.rs b/methods/build.rs
index 11130e5..6d2b67e 100644
--- a/methods/build.rs
+++ b/methods/build.rs
@@ -24,6 +24,7 @@ const SOLIDITY_ELF_PATH: &str = "../tests/Elf.sol";
 fn main() {
     // Builds can be made deterministic, and thereby reproducible, by using Docker to build the
     // guest. Check the RISC0_USE_DOCKER variable and use Docker to build the guest if set.
+    println!("cargo:rerun-if-env-changed=RISC0_USE_DOCKER");
     let use_docker = env::var("RISC0_USE_DOCKER").ok().map(|_| DockerOptions {
         root_dir: Some("../".into()),
     });