diff --git a/internal.h b/internal.h
index 7d6bf1ec72..5a846c13e0 100644
--- a/internal.h
+++ b/internal.h
@@ -2215,7 +2215,7 @@ VALUE rb_thread_shield_release(VALUE self);
 VALUE rb_thread_shield_destroy(VALUE self);
 int rb_thread_to_be_killed(VALUE thread);
 void rb_mutex_allow_trap(VALUE self, int val);
-VALUE rb_uninterruptible(VALUE (*b_proc)(ANYARGS), VALUE data);
+VALUE rb_uninterruptible(VALUE (*b_proc)(VALUE), VALUE data);
 VALUE rb_mutex_owned_p(VALUE self);
 
 /* transcode.c */
diff --git a/thread.c b/thread.c
index 57ccfef8b7..752b8b0cd3 100644
--- a/thread.c
+++ b/thread.c
@@ -5507,7 +5507,7 @@ rb_default_coverage(int n)
 }
 
 VALUE
-rb_uninterruptible(VALUE (*b_proc)(ANYARGS), VALUE data)
+rb_uninterruptible(VALUE (*b_proc)(VALUE), VALUE data)
 {
     VALUE interrupt_mask = rb_ident_hash_new();
     rb_thread_t *cur_th = GET_THREAD();