diff --git a/src/core/fonts.js b/src/core/fonts.js
index 58804a94c..9deb55d18 100644
--- a/src/core/fonts.js
+++ b/src/core/fonts.js
@@ -3277,6 +3277,13 @@ var Font = (function FontClosure() {
           };
         }
         var locaData = loca.data;
+        var locaDataSize = itemSize * (1 + numGlyphs);
+        // is loca.data too short or long?
+        if (locaData.length !== locaDataSize) {
+          locaData = new Uint8Array(locaDataSize);
+          locaData.set(loca.data.subarray(0, locaDataSize));
+          loca.data = locaData;
+        }
         // removing the invalid glyphs
         var oldGlyfData = glyf.data;
         var oldGlyfDataLength = oldGlyfData.length;
@@ -3320,9 +3327,7 @@ var Font = (function FontClosure() {
             glyf.data.set(newGlyfData.subarray(0, writeOffset));
           }
           glyf.data.set(newGlyfData.subarray(0, firstEntryLength), writeOffset);
-          loca.data = new Uint8Array(locaData.length + itemSize);
-          loca.data.set(locaData);
-          itemEncode(loca.data, locaData.length,
+          itemEncode(loca.data, locaData.length - itemSize,
                      writeOffset + firstEntryLength);
         } else {
           glyf.data = newGlyfData.subarray(0, writeOffset);
diff --git a/test/pdfs/.gitignore b/test/pdfs/.gitignore
index f88789fda..01a562b80 100644
--- a/test/pdfs/.gitignore
+++ b/test/pdfs/.gitignore
@@ -42,6 +42,7 @@
 !S2.pdf
 !helloworld-bad.pdf
 !zerowidthline.pdf
+!bug868745.pdf
 !issue1002.pdf
 !issue925.pdf
 !gradientfill.pdf
diff --git a/test/pdfs/bug868745.pdf b/test/pdfs/bug868745.pdf
new file mode 100644
index 000000000..b92db20cc
Binary files /dev/null and b/test/pdfs/bug868745.pdf differ
diff --git a/test/test_manifest.json b/test/test_manifest.json
index 4ef1ca4ac..82ada5c10 100644
--- a/test/test_manifest.json
+++ b/test/test_manifest.json
@@ -198,6 +198,12 @@
        "rounds": 1,
        "type": "load"
     },
+    {  "id": "bug868745",
+       "file": "pdfs/bug868745.pdf",
+       "md5": "86111ea5097dd7daffcdea891ad1b348",
+       "rounds": 1,
+       "type": "load"
+    },
     {  "id": "thuluthfont-pdf",
        "file": "pdfs/ThuluthFeatures.pdf",
        "md5": "b7e18bf7a3d6a9c82aefa12d721072fc",