diff --git a/pyo3-build-config/src/impl_.rs b/pyo3-build-config/src/impl_.rs
index 307565856e5..f9875cdb43b 100644
--- a/pyo3-build-config/src/impl_.rs
+++ b/pyo3-build-config/src/impl_.rs
@@ -1685,6 +1685,8 @@ fn get_env_interpreter() -> Option<PathBuf> {
 ///   4. `python3`, as above
 pub fn find_interpreter() -> Result<PathBuf> {
     if let Some(exe) = env_var("PYO3_PYTHON") {
+        println!("cargo:rerun-if-env-changed=PYO3_PYTHON_VERSION");
+        println!("cargo:rerun-if-env-changed=PYO3_PYTHON_IMPLEMENTATION");
         Ok(exe.into())
     } else if let Some(env_interpreter) = get_env_interpreter() {
         Ok(env_interpreter)