diff --git a/src/js/components/TheQuran/Timer.tsx b/src/js/components/TheQuran/Timer.tsx
index 86da4937b..a59b383ef 100644
--- a/src/js/components/TheQuran/Timer.tsx
+++ b/src/js/components/TheQuran/Timer.tsx
@@ -9,8 +9,8 @@ type TimerProps = {
 };
 
 export function Timer({surah, ayah, stream, setStream}: TimerProps) {
-  const [ms, setMs] = useState(ayah.readingTime);
-  useEffect(() => setMs(ayah.readingTime), [ayah]);
+  const [ms, setMs] = useState(ayah.readTimeMs);
+  useEffect(() => setMs(ayah.readTimeMs), [ayah]);
   useEffect(() => {
     if (stream.length === surah.ayat.length) {
       return;
diff --git a/src/js/lib/Quran/Surah.ts b/src/js/lib/Quran/Surah.ts
index 0c6c21b52..93df14c31 100644
--- a/src/js/lib/Quran/Surah.ts
+++ b/src/js/lib/Quran/Surah.ts
@@ -7,7 +7,7 @@ type SurahDetails = {
   slug: string,
   codepoints: Array<number>
 }
-export type Ayah = {id: number, text: string, readingTime: number};
+export type Ayah = {id: number, text: string, readTimeMs: number};
 export type Ayat = Array<Ayah>;
 
 export class Surah {
@@ -20,7 +20,7 @@ export class Surah {
       ayat.map(([id, text]) => {
         return {
           id, text,
-          readingTime: text.split(" ").length * 500,
+          readTimeMs: text.split(" ").length * 500,
         }
       })
     );