diff --git a/src/core/evaluator.js b/src/core/evaluator.js
index 7f0827116..4cea9d446 100644
--- a/src/core/evaluator.js
+++ b/src/core/evaluator.js
@@ -3620,6 +3620,27 @@ class PartialEvaluator {
         uint8array = new Uint8Array(new Uint32Array(widths).buffer);
         hash.update(uint8array);
       }
+
+      if (composite) {
+        const compositeWidths = dict.get("W") || baseDict.get("W");
+        if (Array.isArray(compositeWidths)) {
+          const widthsBuf = [];
+          for (const entry of compositeWidths) {
+            if (isNum(entry) || isRef(entry)) {
+              widthsBuf.push(entry.toString());
+            } else if (Array.isArray(entry)) {
+              const subWidthsBuf = [];
+              for (const element of entry) {
+                if (isNum(element) || isRef(element)) {
+                  subWidthsBuf.push(element.toString());
+                }
+              }
+              widthsBuf.push(`[${subWidthsBuf.join()}]`);
+            }
+          }
+          hash.update(widthsBuf.join());
+        }
+      }
     }
 
     return {
diff --git a/test/pdfs/.gitignore b/test/pdfs/.gitignore
index 12fbc208e..ced9fac3f 100644
--- a/test/pdfs/.gitignore
+++ b/test/pdfs/.gitignore
@@ -313,6 +313,7 @@
 !noembed-eucjp.pdf
 !noembed-sjis.pdf
 !vertical.pdf
+!issue13343.pdf
 !ZapfDingbats.pdf
 !bug878026.pdf
 !issue1045.pdf
diff --git a/test/pdfs/issue13343.pdf b/test/pdfs/issue13343.pdf
new file mode 100644
index 000000000..e706bacd5
Binary files /dev/null and b/test/pdfs/issue13343.pdf differ
diff --git a/test/test_manifest.json b/test/test_manifest.json
index 61f33ff4d..3f27deedb 100644
--- a/test/test_manifest.json
+++ b/test/test_manifest.json
@@ -132,6 +132,12 @@
        "link": false,
        "type": "eq"
     },
+    {  "id": "issue13343",
+       "file": "pdfs/issue13343.pdf",
+       "md5": "f8bf1888839e15254555092c504e1900",
+       "rounds": 1,
+       "type": "eq"
+    },
     {  "id": "bug921760",
        "file": "pdfs/bug921760.pdf",
        "md5": "1aa136d786a65b0d7cce7bdb3c58c6c3",