diff --git a/src/client/app/common/scripts/gcd.ts b/src/client/app/common/scripts/gcd.ts
deleted file mode 100644
index 9a19f9da6..000000000
--- a/src/client/app/common/scripts/gcd.ts
+++ /dev/null
@@ -1,2 +0,0 @@
-const gcd = (a, b) => !b ? a : gcd(b, a % b);
-export default gcd;
diff --git a/src/client/app/mobile/views/components/drive.file-detail.vue b/src/client/app/mobile/views/components/drive.file-detail.vue
index 43867211e..810889259 100644
--- a/src/client/app/mobile/views/components/drive.file-detail.vue
+++ b/src/client/app/mobile/views/components/drive.file-detail.vue
@@ -67,7 +67,7 @@
 import Vue from 'vue';
 import * as EXIF from 'exif-js';
 import * as hljs from 'highlight.js';
-import gcd from '../../../common/scripts/gcd';
+import { gcd } from '../../../../../prelude/math';
 
 export default Vue.extend({
 	props: ['file'],
diff --git a/src/prelude/math.ts b/src/prelude/math.ts
new file mode 100644
index 000000000..07b94bec3
--- /dev/null
+++ b/src/prelude/math.ts
@@ -0,0 +1,3 @@
+export function gcd(a: number, b: number): number {
+	return b === 0 ? a : gcd(b, a % b);
+}