1 files changed, 1 insertions, 1 deletions
diff --git a/intern.h b/intern.h
index ec08a3f5fa..7c33d7c225 100644
--- a/intern.h
+++ b/intern.h
@@ -273,7 +273,7 @@ VALUE rb_thread_kill(VALUE);
 VALUE rb_thread_create(VALUE (*)(ANYARGS), void*);
 void rb_thread_interrupt(void);
 void rb_thread_trap_eval(VALUE, int, int);
-void rb_thread_signal_raise(char*);
+void rb_thread_signal_raise(const char*); /* should pass literal */
 void rb_thread_signal_exit(void);
 int rb_thread_select(int, fd_set *, fd_set *, fd_set *, struct timeval *);
 void rb_thread_wait_for(struct timeval);