diff --git a/src/core/type1_parser.js b/src/core/type1_parser.js
index ad35fa768..d87c7986d 100644
--- a/src/core/type1_parser.js
+++ b/src/core/type1_parser.js
@@ -679,13 +679,19 @@ var Type1Parser = (function Type1ParserClosure() {
           // here and put an endchar to make the validator happy.
           output = [14];
         }
-        program.charstrings.push({
+        const charStringObject = {
           glyphName: glyph,
           charstring: output,
           width: charString.width,
           lsb: charString.lsb,
           seac: charString.seac,
-        });
+        };
+        if (glyph === ".notdef") {
+          // Make sure .notdef is at index zero (issue #11477).
+          program.charstrings.unshift(charStringObject);
+        } else {
+          program.charstrings.push(charStringObject);
+        }
 
         // Attempt to replace missing widths, from the font dictionary /Widths
         // entry, with ones from the font data (fixes issue11150_reduced.pdf).
diff --git a/test/pdfs/.gitignore b/test/pdfs/.gitignore
index d2db531b2..9b7b4ee8a 100644
--- a/test/pdfs/.gitignore
+++ b/test/pdfs/.gitignore
@@ -299,6 +299,7 @@
 !issue4573.pdf
 !issue4722.pdf
 !issue4800.pdf
+!issue11477_reduced.pdf
 !text_clip_cff_cid.pdf
 !issue4801.pdf
 !issue5334.pdf
diff --git a/test/pdfs/issue11477_reduced.pdf b/test/pdfs/issue11477_reduced.pdf
new file mode 100644
index 000000000..d0abc3771
Binary files /dev/null and b/test/pdfs/issue11477_reduced.pdf differ
diff --git a/test/test_manifest.json b/test/test_manifest.json
index 71c4bafe3..1493f4d9b 100644
--- a/test/test_manifest.json
+++ b/test/test_manifest.json
@@ -1456,6 +1456,12 @@
        "rounds": 1,
        "type": "eq"
     },
+    {  "id": "issue11477",
+       "file": "pdfs/issue11477_reduced.pdf",
+       "md5": "f4e5735569afce79e52b3fd56d10ae13",
+       "rounds": 1,
+       "type": "eq"
+    },
     {  "id": "issue7665",
        "file": "pdfs/issue7665.pdf",
        "md5": "f1199d16195a61e8232e2d1e742ed46b",