diff --git a/gnu/packages/haskell-xyz.scm b/gnu/packages/haskell-xyz.scm
index 940fbe8a6c586bb140ec156e678b4fd68ad0ed07..ee26c1a25abe36a19435cfd4052dbfcf226a9720 100644
--- a/gnu/packages/haskell-xyz.scm
+++ b/gnu/packages/haskell-xyz.scm
@@ -5,7 +5,7 @@
 ;;; Copyright © 2015, 2019 Eric Bavier <bavier@member.fsf.org>
 ;;; Copyright © 2016, 2018, 2019 Ludovic Courtès <ludo@gnu.org>
 ;;; Copyright © 2016, 2017 ng0 <ng0@n0.is>
-;;; Copyright © 2016 Efraim Flashner <efraim@flashner.co.il>
+;;; Copyright © 2016, 2019 Efraim Flashner <efraim@flashner.co.il>
 ;;; Copyright © 2015, 2016, 2017, 2018, 2019 Ricardo Wurmus <rekado@elephly.net>
 ;;; Copyright © 2016, 2017 David Craven <david@craven.ch>
 ;;; Copyright © 2017 Danny Milosavljevic <dannym@scratchpost.org>
@@ -463,7 +463,7 @@ (define-public ghc-attoparsec-bootstrap
     (inputs
      `(("ghc-scientific" ,ghc-scientific-bootstrap)))
     (native-inputs '())
-    (properties '(hidden? #t))))
+    (properties '((hidden? #t)))))
 
 (define-public ghc-attoparsec-iso8601
   (package
@@ -5201,7 +5201,7 @@ (define-public ghc-integer-logarithms-bootstrap
     (name "ghc-integer-logarithms-bootstrap")
     (arguments `(#:tests? #f))
     (native-inputs '())
-    (properties '(hidden? #t))))
+    (properties '((hidden? #t)))))
 
 (define-public ghc-interpolate
   (package
@@ -8667,7 +8667,7 @@ (define-public ghc-scientific-bootstrap
        ("ghc-hashable" ,ghc-hashable)
        ("ghc-primitive" ,ghc-primitive)))
     (native-inputs '())
-    (properties '(hidden? #t))))
+    (properties '((hidden? #t)))))
 
 (define-public ghc-sdl
   (package
@@ -8951,7 +8951,7 @@ (define-public ghc-semigroups-bootstrap
        ("ghc-tagged" ,ghc-tagged)
        ("ghc-unordered-containers" ,ghc-unordered-containers-bootstrap)
        ("ghc-hashable" ,ghc-hashable-bootstrap)))
-    (properties '(hidden? #t))))
+    (properties '((hidden? #t)))))
 
 (define-public ghc-setenv
   (package
@@ -10781,7 +10781,7 @@ (define-public ghc-unordered-containers-bootstrap
     (arguments `(#:tests? #f))
     (inputs
      `(("ghc-hashable" ,ghc-hashable-bootstrap)))
-    (properties '(hidden? #t))))
+    (properties '((hidden? #t)))))
 
 (define-public ghc-unsafe
   (package
@@ -11322,7 +11322,7 @@ (define-public ghc-wcwidth-bootstrap
      `(("ghc-setlocale" ,ghc-setlocale)
        ("ghc-utf8-string" ,ghc-utf8-string)
        ("ghc-attoparsec" ,ghc-attoparsec-bootstrap)))
-    (properties '(hidden? #t))))
+    (properties '((hidden? #t)))))
 
 (define-public ghc-weigh
   (package