diff --git a/CHANGELOG b/CHANGELOG
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,5 +1,11 @@
 ** 1.10.x
 
+1.10.0 --> 1.10.1
+===============
+
+* Enable the unicode version of DoubleColon (x2237). Thanks
+  to Andrés Sicard-Ramírez for the patch!
+
 1.9.6 --> 1.10.0
 ===============
 
diff --git a/haskell-src-exts.cabal b/haskell-src-exts.cabal
--- a/haskell-src-exts.cabal
+++ b/haskell-src-exts.cabal
@@ -1,5 +1,5 @@
 Name:                   haskell-src-exts
-Version:                1.10.0
+Version:                1.10.1
 License:                BSD3
 License-File:           LICENSE
 Author:                 Niklas Broberg
diff --git a/src/Language/Haskell/Exts/Lexer.hs b/src/Language/Haskell/Exts/Lexer.hs
--- a/src/Language/Haskell/Exts/Lexer.hs
+++ b/src/Language/Haskell/Exts/Lexer.hs
@@ -217,6 +217,7 @@
  ( "\x2190",    (LeftArrow,     Just (Any  [UnicodeSyntax])) ),
  ( "\x2192",    (RightArrow,    Just (Any  [UnicodeSyntax])) ),
  ( "\x21d2",    (DoubleArrow,   Just (Any  [UnicodeSyntax])) ),
+ ( "\x2237",    (DoubleColon,   Just (Any  [UnicodeSyntax])) ),
  ( "\x2919",    (LeftArrowTail,     Just (All [UnicodeSyntax, Arrows])) ),
  ( "\x291a",    (RightArrowTail,    Just (All [UnicodeSyntax, Arrows])) ),
  ( "\x291b",    (LeftDblArrowTail,  Just (All [UnicodeSyntax, Arrows])) ),