diff --git a/apps/viewer/lib/ConfigLexicon.php b/apps/viewer/lib/ConfigLexicon.php
index f4074f2808133..5829b6d5d06fc 100644
--- a/apps/viewer/lib/ConfigLexicon.php
+++ b/apps/viewer/lib/ConfigLexicon.php
@@ -25,6 +25,7 @@ class ConfigLexicon implements ILexicon {
 	public const SLIDESHOW_DELAY = 'slideshow_delay';
 	public const VOLUME = 'volume';
 	public const MUTED = 'muted';
+	public const ORIGINAL_IMAGES = 'original_images';
 
 	#[\Override]
 	public function getStrictness(): Strictness {
@@ -57,6 +58,12 @@ public function getUserConfigs(): array {
 				defaultRaw: false,
 				definition: 'Whether videos and audio start muted',
 			),
+			new Entry(
+				self::ORIGINAL_IMAGES,
+				ValueType::BOOL,
+				defaultRaw: false,
+				definition: 'Whether images are shown from the file itself rather than from a preview',
+			),
 		];
 	}
 }
diff --git a/apps/viewer/tests/Service/UserConfigTest.php b/apps/viewer/tests/Service/UserConfigTest.php
index 7d185599c3906..f6d018fd60952 100644
--- a/apps/viewer/tests/Service/UserConfigTest.php
+++ b/apps/viewer/tests/Service/UserConfigTest.php
@@ -91,9 +91,10 @@ public function testReadsEverySettingTheLexiconDeclares(): void {
 		]);
 		$this->getAutoMock(IUserConfig::class)->method('getValueBool')->willReturnMap([
 			['alice', 'viewer', 'muted', false, false, true],
+			['alice', 'viewer', 'original_images', false, false, true],
 		]);
 
-		$this->assertSame(['slideshow_delay' => 10, 'volume' => 40, 'muted' => true], $this->config->getConfigs());
+		$this->assertSame(['slideshow_delay' => 10, 'volume' => 40, 'muted' => true, 'original_images' => true], $this->config->getConfigs());
 	}
 
 	public function testNeedsAUser(): void {