diff --git a/src/core/fonts.js b/src/core/fonts.js
index 751183a93..a22e7a1bc 100644
--- a/src/core/fonts.js
+++ b/src/core/fonts.js
@@ -3250,7 +3250,10 @@ var Font = (function FontClosure() {
           }
         }
 
-        if (!potentialTable) {
+        if (potentialTable) {
+          font.pos = start + potentialTable.offset;
+        }
+        if (!potentialTable || font.peekByte() === -1) {
           warn('Could not find a preferred cmap table.');
           return {
             platformId: -1,
@@ -3260,7 +3263,6 @@ var Font = (function FontClosure() {
           };
         }
 
-        font.pos = start + potentialTable.offset;
         var format = font.getUint16();
         var length = font.getUint16();
         var language = font.getUint16();