diff --git a/yjit/src/invariants.rs b/yjit/src/invariants.rs
index 4814e7a1c76d45..f32d51131d0bc8 100644
--- a/yjit/src/invariants.rs
+++ b/yjit/src/invariants.rs
@@ -348,7 +348,7 @@ pub extern "C" fn rb_yjit_constant_state_changed(id: ID) {
 /// Callback for marking GC objects inside [Invariants].
 /// See `struct yjijt_root_struct` in C.
 #[no_mangle]
-pub extern "C" fn rb_yjit_root_mark() {
+pub extern "C" fn rb_yjit_root_mark(_: *mut c_void) {
     // Call rb_gc_mark on exit location's raw_samples to
     // wrap frames in a GC allocated object. This needs to be called
     // at the same time as root mark.