diff --git a/Lib/test/test_imp.py b/Lib/test/test_imp.py
index cc4c05e0f..0d40b3ce1 100644
--- a/Lib/test/test_imp.py
+++ b/Lib/test/test_imp.py
@@ -353,8 +353,6 @@ class ImportTests(unittest.TestCase):
         self.assertEqual(_imp.source_hash(42, b'hi'), b'\xc6\xe7Z\r\x03:}\xab')
         self.assertEqual(_imp.source_hash(43, b'hi'), b'\x85\x9765\xf8\x9a\x8b9')
 
-    # TODO: RUSTPYTHON
-    @unittest.expectedFailure
     def test_pyc_invalidation_mode_from_cmdline(self):
         cases = [
             ([], "default"),
diff --git a/src/lib.rs b/src/lib.rs
index f876676ea..fae4c9e3b 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -206,6 +206,14 @@ fn parse_arguments<'a>(app: App<'a, '_>) -> ArgMatches<'a> {
                 .number_of_values(1)
                 .help("warning control; arg is action:message:category:module:lineno"),
         )
+        .arg(
+            Arg::with_name("check-hash-based-pycs")
+                .long("check-hash-based-pycs")
+                .takes_value(true)
+                .number_of_values(1)
+                .default_value("default")
+                .help("always|default|never\ncontrol how Python invalidates hash-based .pyc files"),
+        )
         .arg(
             Arg::with_name("bytes-warning")
                 .short("b")
@@ -321,6 +329,11 @@ fn create_settings(matches: &ArgMatches) -> Settings {
         settings.dont_write_bytecode = true;
     }
 
+    settings.check_hash_based_pycs = matches
+        .value_of("check-hash-based-pycs")
+        .unwrap_or("default")
+        .to_owned();
+
     let mut dev_mode = false;
     let mut warn_default_encoding = false;
     if let Some(xopts) = matches.values_of("implementation-option") {
diff --git a/vm/src/stdlib/imp.rs b/vm/src/stdlib/imp.rs
index ab18738ff..919b425e9 100644
--- a/vm/src/stdlib/imp.rs
+++ b/vm/src/stdlib/imp.rs
@@ -55,6 +55,12 @@ mod _imp {
         import, PyObjectRef, PyRef, PyResult, TryFromObject, VirtualMachine,
     };
 
+    #[pyattr]
+    fn check_hash_based_pycs(vm: &VirtualMachine) -> PyStrRef {
+        vm.ctx
+            .new_str(vm.state.settings.check_hash_based_pycs.clone())
+    }
+
     #[pyfunction]
     fn extension_suffixes() -> PyResult<Vec<PyObjectRef>> {
         Ok(Vec::new())
diff --git a/vm/src/vm/setting.rs b/vm/src/vm/setting.rs
index dbb571455..4a9b3d710 100644
--- a/vm/src/vm/setting.rs
+++ b/vm/src/vm/setting.rs
@@ -62,6 +62,9 @@ pub struct Settings {
     // TODO: use this; can TextIOWrapper even work with a non-buffered?
     pub stdio_unbuffered: bool,
 
+    /// --check-hash-based-pycs
+    pub check_hash_based_pycs: String,
+
     /// false for wasm. Not a command-line option
     pub allow_external_library: bool,
 }
@@ -93,6 +96,7 @@ impl Default for Settings {
             argv: vec![],
             hash_seed: None,
             stdio_unbuffered: false,
+            check_hash_based_pycs: "default".to_owned(),
             allow_external_library: cfg!(feature = "importlib"),
         }
     }