diff --git a/src/core/evaluator.js b/src/core/evaluator.js
index 4cea9d446..ee9017558 100644
--- a/src/core/evaluator.js
+++ b/src/core/evaluator.js
@@ -3622,6 +3622,8 @@ class PartialEvaluator {
       }
 
       if (composite) {
+        hash.update("compositeFont");
+
         const compositeWidths = dict.get("W") || baseDict.get("W");
         if (Array.isArray(compositeWidths)) {
           const widthsBuf = [];