diff --git a/crates/config/src/lib.rs b/crates/config/src/lib.rs
index 8836b9e2..f1dcbbfd 100644
--- a/crates/config/src/lib.rs
+++ b/crates/config/src/lib.rs
@@ -31,6 +31,7 @@ bitflags! {
         const JAVY_STREAM_IO = 1 << 2;
         const REDIRECT_STDOUT_TO_STDERR = 1 << 3;
         const TEXT_ENCODING = 1 << 4;
+        const JAVY_CRYPTOX = 1 << 5;
     }
 }
 
@@ -44,5 +45,6 @@ mod tests {
         assert!(Config::JAVY_STREAM_IO == Config::from_bits(1 << 2).unwrap());
         assert!(Config::REDIRECT_STDOUT_TO_STDERR == Config::from_bits(1 << 3).unwrap());
         assert!(Config::TEXT_ENCODING == Config::from_bits(1 << 4).unwrap());
+        assert!(Config::JAVY_CRYPTOX == Config::from_bits(1 << 5).unwrap());
     }
 }
diff --git a/crates/core/src/runtime.rs b/crates/core/src/runtime.rs
index ee366cd8..1e52c74b 100644
--- a/crates/core/src/runtime.rs
+++ b/crates/core/src/runtime.rs
@@ -13,7 +13,7 @@ pub(crate) fn new(shared_config: SharedConfig) -> Result<Runtime> {
         // fix forward.
         .override_json_parse_and_stringify(false)
         .javy_json(false)
-        .javy_cryptox(true);
+        .javy_cryptox(shared_config.contains(SharedConfig::JAVY_CRYPTOX));
 
     Runtime::new(std::mem::take(config))
 }