diff --git a/ext/hbsdctl.rb/feature.c b/ext/hbsdctl.rb/feature.c
index a2430c3..e4a5899 100644
--- a/ext/hbsdctl.rb/feature.c
+++ b/ext/hbsdctl.rb/feature.c
@@ -1,7 +1,8 @@
 #include <libhbsdcontrol.h>
 #include <unistd.h>
 #include "include/feature.h"
-static VALUE get_rb_eError(void);
+static VALUE __rb_eError(void);
+static VALUE __set(VALUE, VALUE, VALUE);
 
 /**
  * BSD::Control::Feature#set!
@@ -12,30 +13,35 @@ feature_set(VALUE self, VALUE rb_path, VALUE rb_state)
   Check_Type(rb_path, T_STRING);
   Check_Type(rb_state, T_FIXNUM);
   if (getuid() != 0) {
-    rb_raise(get_rb_eError(), "This operation requires root privileges.");
+    rb_raise(__rb_eError(), "This operation requires root privileges.");
   } else if (rb_funcall(rb_cFile, rb_intern("exist?"), 1, rb_path) == Qfalse) {
-    rb_raise(get_rb_eError(), "The given path does not exist.");
+    rb_raise(__rb_eError(), "The given path does not exist.");
   } else {
-    int r;
-    VALUE rb_name;
-    rb_name = rb_funcall(self, rb_intern("name"), 0);
-    Check_Type(rb_name, T_STRING);
-    r = hbsdcontrol_set_feature_state(
-      RSTRING_PTR(rb_path),
-      RSTRING_PTR(rb_name),
-      NUM2INT(rb_state)
-      );
-    if (r == 0) {
-      return (Qtrue);
-    } else {
-      rb_raise(get_rb_eError(), "hbsdcontrol_set_feature_state failed");
-    }
+    VALUE rb_feature = rb_funcall(self, rb_intern("name"), 0);
+    Check_Type(rb_feature, T_STRING);
+    return (__set(rb_path, rb_feature, rb_state));
   }
 }
 
 
 static VALUE
-get_rb_eError(void)
+__set(VALUE rb_path, VALUE rb_feature, VALUE rb_state)
+{
+  int result = hbsdcontrol_set_feature_state(
+    RSTRING_PTR(rb_path),
+    RSTRING_PTR(rb_feature),
+    NUM2INT(rb_state)
+    );
+  if (result == 0) {
+    return (Qtrue);
+  } else {
+    rb_raise(__rb_eError(), "hbsdcontrol_set_feature_state failed");
+  }
+}
+
+
+static VALUE
+__rb_eError(void)
 {
   VALUE rb_mBSD = rb_const_get(rb_cObject, rb_intern("BSD")),
     rb_mControl = rb_const_get(rb_mBSD, rb_intern("Control")),