diff --git a/ext/mixed/js/japanese.js b/ext/mixed/js/japanese.js
index 1201e524..e2d7a090 100644
--- a/ext/mixed/js/japanese.js
+++ b/ext/mixed/js/japanese.js
@@ -107,10 +107,11 @@ function jpDistributeFuriganaInflected(expression, reading, source) {
     }
     const offset = source.length - stemLength;
 
-    for (const segment of jpDistributeFurigana(
-        source.slice(0, offset === 0 ? source.length : source.length - offset),
-        reading.slice(0, offset === 0 ? reading.length : reading.length - expression.length + stemLength)
-    )) {
+    const stemExpression = source.slice(0, source.length - offset);
+    const stemReading = reading.slice(
+        0, offset === 0 ? reading.length : reading.length - expression.length + stemLength
+    );
+    for (const segment of jpDistributeFurigana(stemExpression, stemReading)) {
         output.push(segment);
     }