diff --git a/lib/elixir/src/elixir_interpolation.erl b/lib/elixir/src/elixir_interpolation.erl
index ab52f8d91d1..d46d7ce9594 100644
--- a/lib/elixir/src/elixir_interpolation.erl
+++ b/lib/elixir/src/elixir_interpolation.erl
@@ -77,7 +77,13 @@ extract_char(Rest, Buffer, Output, Line, Column, Scope, Interpol, Last) ->
     ?bidi(Char) ->
       Token = io_lib:format("\\u~4.16.0B", [Char]),
       Pre = "invalid bidirectional formatting character in string: ",
-      Pos = io_lib:format(". If you want to use such character, use it in its escaped ~ts form instead", [Token]),
+      Pos = io_lib:format(". If you want to use such a character, use it in its escaped ~ts form instead", [Token]),
+      {error, {Line, Column, {Pre, Pos}, Token}};
+
+    ?confusable(Char) ->
+      Token = io_lib:format("\\u~4.16.0B", [Char]),
+      Pre = "invalid confusable character in string: ",
+      Pos = io_lib:format(". If you want to use such a character, use it in its escaped ~ts form instead", [Token]),
       {error, {Line, Column, {Pre, Pos}, Token}};
 
     true ->
diff --git a/lib/elixir/src/elixir_tokenizer.hrl b/lib/elixir/src/elixir_tokenizer.hrl
index 6857db4b834..7024a8f740c 100644
--- a/lib/elixir/src/elixir_tokenizer.hrl
+++ b/lib/elixir/src/elixir_tokenizer.hrl
@@ -29,3 +29,54 @@
                  C =:= 16#2068;
                  C =:= 16#202C;
                  C =:= 16#2069).
+
+%% Confusables
+%% Processed from http://www.unicode.org/reports/tr39
+-define(confusable(C), C =:= 16#3164;
+                       C =:= 16#7FA;
+                       C =:= 16#30FC;
+                       C =:= 16#A7F7;
+                       C =:= 16#1173;
+                       C =:= 16#3161;
+                       C =:= 16#A4F9;
+                       C =:= 16#2D0;
+                       C =:= 16#A4FD;
+                       C =:= 16#1C3;
+                       C =:= 16#2D51;
+                       C =:= 16#294;
+                       C =:= 16#97D;
+                       C =:= 16#A6EB;
+                       C =:= 16#A4F8;
+                       C =:= 16#A78F;
+                       C =:= 16#1427;
+                       C =:= 16#1427;
+                       C =:= 16#2B9;
+                       C =:= 16#2C8;
+                       C =:= 16#2CA;
+                       C =:= 16#2CB;
+                       C =:= 16#2BB;
+                       C =:= 16#2BD;
+                       C =:= 16#2BC;
+                       C =:= 16#2BE;
+                       C =:= 16#A78C;
+                       C =:= 16#7F4;
+                       C =:= 16#7F5;
+                       C =:= 16#144A;
+                       C =:= 16#16CC;
+                       C =:= 16#2BA;
+                       C =:= 16#2EE;
+                       C =:= 16#5F2;
+                       C =:= 16#1031F;
+                       C =:= 16#3033;
+                       C =:= 16#30CE;
+                       C =:= 16#4E3F;
+                       C =:= 16#4E36;
+                       C =:= 16#30FD;
+                       C =:= 16#A778;
+                       C =:= 16#1029B;
+                       C =:= 16#1438;
+                       C =:= 16#16B2;
+                       C =:= 16#304F;
+                       C =:= 16#21FE8;
+                       C =:= 16#1433;
+                       C =:= 16#16F3F).
diff --git a/lib/elixir/test/elixir/kernel/errors_test.exs b/lib/elixir/test/elixir/kernel/errors_test.exs
index 94aa18c38af..aef2fe6a7eb 100644
--- a/lib/elixir/test/elixir/kernel/errors_test.exs
+++ b/lib/elixir/test/elixir/kernel/errors_test.exs
@@ -816,7 +816,7 @@ defmodule Kernel.ErrorsTest do
                       'x = 8; <<a, b::size(^x)>> = <<?a, ?b>>'
   end
 
-  test "invalid bidi in source" do
+  test "invalid bidi or confusable in source" do
     assert_eval_raise SyntaxError,
                       ~r"nofile:1:1: invalid bidirectional formatting character in comment: \\u202A",
                       '# This is a \u202A'
@@ -826,12 +826,18 @@ defmodule Kernel.ErrorsTest do
                       'foo. # This is a \u202A'
 
     assert_eval_raise SyntaxError,
-                      ~r"nofile:1:12: invalid bidirectional formatting character in string: \\u202A. If you want to use such character, use it in its escaped \\u202A form instead",
+                      ~r"nofile:1:12: invalid bidirectional formatting character in string: \\u202A. If you want to use such a character, use it in its escaped \\u202A form instead",
                       '"this is a \u202A"'
 
     assert_eval_raise SyntaxError,
-                      ~r"nofile:1:13: invalid bidirectional formatting character in string: \\u202A. If you want to use such character, use it in its escaped \\u202A form instead",
+                      ~r"nofile:1:13: invalid bidirectional formatting character in string: \\u202A. If you want to use such a character, use it in its escaped \\u202A form instead",
                       '"this is a \\\u202A"'
+
+    assert_eval_raise SyntaxError,
+                      ~r"nofile:1:12: invalid confusable character in string: \\u3164. If you want to use such a character, use it in its escaped \\u3164 form instead",
+                      '"this is a \u3164"'
+
+    Code.eval_string("# confusables are 𝖿𝗂ոе in comments, even hangul filler: #{"\u3164"}")
   end
 
   test "function head with guard" do