diff --git a/src/jsx_utils.erl b/src/jsx_utils.erl
index 78bd7bc..b3125d3 100644
--- a/src/jsx_utils.erl
+++ b/src/jsx_utils.erl
@@ -649,8 +649,8 @@ extended_codepoints() ->
         lists:seq(16#10000, 16#1fffd) ++ [
             16#20000, 16#30000, 16#40000, 16#50000, 16#60000,
             16#70000, 16#80000, 16#90000, 16#a0000, 16#b0000,
-            16#c0000, 16#d0000, 16#e0000, 16#f0000
-        ] ++ lists:seq(16#100000, 16#10fffd)
+            16#c0000, 16#d0000, 16#e0000, 16#f0000, 16#100000
+        ]
     ).
 
 noncharacters() -> [ to_fake_utf8(N) || N <- lists:seq(16#fffe, 16#ffff) ].