diff --git a/error.c b/error.c
index 61ba07c5b4..254cfe17f0 100644
--- a/error.c
+++ b/error.c
@@ -646,10 +646,12 @@ VALUE rb_mErrno;
 static VALUE rb_eNOERROR;
 
 static ID id_new, id_cause, id_message, id_backtrace;
-static ID id_status, id_name, id_args, id_Errno, id_errno, id_i_path;
+static ID id_name, id_args, id_Errno, id_errno, id_i_path;
+extern ID ruby_static_id_status;
 #define id_bt idBt
 #define id_bt_locations idBt_locations
 #define id_mesg idMesg
+#define id_status ruby_static_id_status
 
 #undef rb_exc_new_cstr
 
@@ -1913,7 +1915,6 @@ Init_Exception(void)
     id_cause = rb_intern_const("cause");
     id_message = rb_intern_const("message");
     id_backtrace = rb_intern_const("backtrace");
-    id_status = rb_intern_const("status");
     id_name = rb_intern_const("name");
     id_args = rb_intern_const("args");
     id_Errno = rb_intern_const("Errno");
diff --git a/eval.c b/eval.c
index 3fef29a831..faa80ff5db 100644
--- a/eval.c
+++ b/eval.c
@@ -24,6 +24,10 @@ NORETURN(void rb_raise_jump(VALUE, VALUE));
 VALUE rb_eLocalJumpError;
 VALUE rb_eSysStackError;
 
+ID ruby_static_id_signo, ruby_static_id_status;
+#define id_signo ruby_static_id_signo
+#define id_status ruby_static_id_status
+
 #define exception_error GET_VM()->special_exceptions[ruby_error_reenter]
 
 #include "eval_error.c"
@@ -218,7 +222,7 @@ ruby_cleanup(volatile int ex)
 	    break;
 	}
 	else if (rb_obj_is_kind_of(err, rb_eSignal)) {
-	    VALUE sig = rb_iv_get(err, "signo");
+	    VALUE sig = rb_ivar_get(err, id_signo);
 	    state = NUM2INT(sig);
 	    break;
 	}
@@ -1711,4 +1715,7 @@ Init_eval(void)
     rb_define_global_function("untrace_var", rb_f_untrace_var, -1);	/* in variable.c */
 
     rb_vm_register_special_exception(ruby_error_reenter, rb_eFatal, "exception reentered");
+
+    id_signo = rb_intern_const("signo");
+    id_status = rb_intern_const("status");
 }
diff --git a/eval_error.c b/eval_error.c
index 405d738236..c32eff13f2 100644
--- a/eval_error.c
+++ b/eval_error.c
@@ -255,7 +255,7 @@ rb_print_inaccessible(VALUE klass, ID id, int scope)
 static int
 sysexit_status(VALUE err)
 {
-    VALUE st = rb_iv_get(err, "status");
+    VALUE st = rb_ivar_get(err, id_status);
     return NUM2INT(st);
 }
 
@@ -303,7 +303,7 @@ error_handle(int ex)
 	    status = sysexit_status(errinfo);
 	}
 	else if (rb_obj_is_instance_of(errinfo, rb_eSignal) &&
-		 rb_iv_get(errinfo, "signo") != INT2FIX(SIGSEGV)) {
+		 rb_ivar_get(errinfo, id_signo) != INT2FIX(SIGSEGV)) {
 	    /* no message when exiting by signal */
 	}
 	else {
diff --git a/process.c b/process.c
index c52e6ac896..ea683e79f9 100644
--- a/process.c
+++ b/process.c
@@ -256,7 +256,7 @@ typedef unsigned LONG_LONG unsigned_clock_t;
 #endif
 
 static ID id_in, id_out, id_err, id_pid, id_uid, id_gid;
-static ID id_close, id_child, id_status;
+static ID id_close, id_child;
 #ifdef HAVE_SETPGID
 static ID id_pgroup;
 #endif
@@ -279,6 +279,8 @@ static ID id_CLOCK_BASED_CLOCK_PROCESS_CPUTIME_ID;
 static ID id_MACH_ABSOLUTE_TIME_BASED_CLOCK_MONOTONIC;
 #endif
 static ID id_hertz;
+extern ID ruby_static_id_status;
+#define id_status ruby_static_id_status
 
 /*
  *  call-seq:
@@ -7820,7 +7822,6 @@ Init_process(void)
     id_gid = rb_intern("gid");
     id_close = rb_intern("close");
     id_child = rb_intern("child");
-    id_status = rb_intern("status");
 #ifdef HAVE_SETPGID
     id_pgroup = rb_intern("pgroup");
 #endif
diff --git a/signal.c b/signal.c
index dcce2b2f2d..f64c24c599 100644
--- a/signal.c
+++ b/signal.c
@@ -45,6 +45,9 @@
 # include "nacl/signal.h"
 #endif
 
+extern ID ruby_static_id_signo;
+#define id_signo ruby_static_id_signo
+
 #ifdef NEED_RUBY_ATOMIC_OPS
 rb_atomic_t
 ruby_atomic_exchange(rb_atomic_t *ptr, rb_atomic_t val)
@@ -326,7 +329,7 @@ esignal_init(int argc, VALUE *argv, VALUE self)
 	sig = rb_sprintf("SIG%s", signm);
     }
     rb_call_super(1, &sig);
-    rb_iv_set(self, "signo", INT2NUM(signo));
+    rb_ivar_set(self, id_signo, INT2NUM(signo));
 
     return self;
 }
@@ -341,7 +344,7 @@ esignal_init(int argc, VALUE *argv, VALUE self)
 static VALUE
 esignal_signo(VALUE self)
 {
-    return rb_iv_get(self, "signo");
+    return rb_ivar_get(self, id_signo);
 }
 
 /* :nodoc: */