diff --git a/core/imageboard/image.php b/core/imageboard/image.php
index 2aafc217..49457c4f 100644
--- a/core/imageboard/image.php
+++ b/core/imageboard/image.php
@@ -405,7 +405,7 @@ class Image implements \ArrayAccess
                 $image_link = make_link($image_link);
             }
             $chosen = $image_link;
-        } elseif ($config->get_bool('nice_urls', false)) {
+        } elseif ($config->get_bool(SetupConfig::NICE_URLS, false)) {
             $chosen = make_link($nice);
         } else {
             $chosen = make_link($plain);
diff --git a/core/tests/UrlsTest.php b/core/tests/UrlsTest.php
index bc92e987..59853363 100644
--- a/core/tests/UrlsTest.php
+++ b/core/tests/UrlsTest.php
@@ -33,7 +33,7 @@ class UrlsTest extends TestCase
 
         global $config;
         foreach([true, false] as $nice_urls) {
-            $config->set_bool('nice_urls', $nice_urls);
+            $config->set_bool(SetupConfig::NICE_URLS, $nice_urls);
 
             $this->assertEquals(
                 ["bar", "foo"],
@@ -55,7 +55,7 @@ class UrlsTest extends TestCase
     {
         global $config;
         foreach([true, false] as $nice_urls) {
-            $config->set_bool('nice_urls', $nice_urls);
+            $config->set_bool(SetupConfig::NICE_URLS, $nice_urls);
 
             // basic
             $this->assertEquals(
@@ -94,7 +94,7 @@ class UrlsTest extends TestCase
     {
         global $config;
         foreach([true, false] as $nice_urls) {
-            $config->set_bool('nice_urls', $nice_urls);
+            $config->set_bool(SetupConfig::NICE_URLS, $nice_urls);
 
             $this->assertEquals(
                 $nice_urls ? "/test/post/list/bar%20foo/1" : "/test/index.php?q=post/list/bar%20foo/1",
@@ -267,7 +267,7 @@ class UrlsTest extends TestCase
     public function tearDown(): void
     {
         global $config;
-        $config->set_bool('nice_urls', true);
+        $config->set_bool(SetupConfig::NICE_URLS, true);
         parent::tearDown();
     }
 }
diff --git a/core/urls.php b/core/urls.php
index f43e08fa..b6ecca4d 100644
--- a/core/urls.php
+++ b/core/urls.php
@@ -55,7 +55,7 @@ function make_link(?string $page = null, ?string $query = null, ?string $fragmen
 
     $parts = [];
     $install_dir = get_base_href();
-    if (SPEED_HAX || $config->get_bool('nice_urls', false)) {
+    if (SPEED_HAX || $config->get_bool(SetupConfig::NICE_URLS, false)) {
         $parts['path'] = "$install_dir/$page";
     } else {
         $parts['path'] = "$install_dir/index.php";
diff --git a/ext/setup/config.php b/ext/setup/config.php
index b9439f48..bcf0b580 100644
--- a/ext/setup/config.php
+++ b/ext/setup/config.php
@@ -12,4 +12,5 @@ class SetupConfig
     public const THEME = "theme";
     public const WORD_WRAP = "word_wrap";
     public const COMMENT_CAPTCHA = "comment_captcha";
+    public const NICE_URLS = "nice_urls";
 }
diff --git a/ext/setup/main.php b/ext/setup/main.php
index 04410707..bb8d2f37 100644
--- a/ext/setup/main.php
+++ b/ext/setup/main.php
@@ -369,7 +369,7 @@ class Setup extends Extension
         $sb->add_text_option("contact_link", "<br>Contact URL: ");
         $sb->add_choice_option(SetupConfig::THEME, $themes, "<br>Theme: ");
         //$sb->add_multichoice_option("testarray", array("a" => "b", "c" => "d"), "<br>Test Array: ");
-        $sb->add_bool_option("nice_urls", "<br>Nice URLs: ");
+        $sb->add_bool_option(SetupConfig::NICE_URLS, "<br>Nice URLs: ");
         $sb->add_label("<span id='nicetest'>(Javascript inactive, can't test!)</span>");
 
         $sb = $event->panel->create_new_block("Remote API Integration");
diff --git a/ext/upload/theme.php b/ext/upload/theme.php
index 9ffb6c74..aa2710e3 100644
--- a/ext/upload/theme.php
+++ b/ext/upload/theme.php
@@ -161,7 +161,7 @@ class UploadTheme extends Themelet
         $title = $config->get_string(SetupConfig::TITLE);
         $max_size = $config->get_int(UploadConfig::SIZE);
         $max_kb = to_shorthand_int($max_size);
-        $delimiter = $config->get_bool('nice_urls') ? '?' : '&amp;';
+        $delimiter = $config->get_bool(SetupConfig::NICE_URLS) ? '?' : '&amp;';
 
         $js = 'javascript:(
             function() {