diff --git a/gnu/packages/bioinformatics.scm b/gnu/packages/bioinformatics.scm
index 5412440fb14ece372e4e8d573af321286dc208dd..89f1ac36ea07a3b1a50e0df347a3b94bdde37fe1 100644
--- a/gnu/packages/bioinformatics.scm
+++ b/gnu/packages/bioinformatics.scm
@@ -8427,7 +8427,7 @@ (define-public rcas-web
      `(("r-minimal" ,r-minimal)
        ("r-rcas" ,r-rcas)
        ("guile-next" ,guile-2.2)
-       ("guile-json" ,guile-json)
+       ("guile-json" ,guile-json-1)
        ("guile-redis" ,guile-redis)))
     (native-inputs
      `(("pkg-config" ,pkg-config)))
diff --git a/gnu/packages/ci.scm b/gnu/packages/ci.scm
index eb5f665fc18c1731d05cd9bc43d7ea95b5ab5347..4af2cdc6ea52b47eb00454eab70289bb2266f7d7 100644
--- a/gnu/packages/ci.scm
+++ b/gnu/packages/ci.scm
@@ -121,7 +121,7 @@ (define-public cuirass
        `(("guile" ,guile-2.2)
          ("guile-fibers" ,guile-fibers)
          ("guile-gcrypt" ,guile-gcrypt)
-         ("guile-json" ,guile-json)
+         ("guile-json" ,guile-json-1)
          ("guile-sqlite3" ,guile-sqlite3)
          ("guile-git" ,guile-git)
          ;; FIXME: this is propagated by "guile-git", but it needs to be among
diff --git a/gnu/packages/guile-xyz.scm b/gnu/packages/guile-xyz.scm
index c16342deb055eb1977f52f913688c4b22ddca938..6dcdcedccfd0b32099b0c63a4a097d485ecceab9 100644
--- a/gnu/packages/guile-xyz.scm
+++ b/gnu/packages/guile-xyz.scm
@@ -146,7 +146,7 @@ (define-public artanis
       ;; projects.
       ;; TODO: Add guile-dbi and guile-dbd optional dependencies.
       (inputs `(("guile" ,guile-2.2)
-                ("guile-json" ,guile-json)
+                ("guile-json" ,guile-json-1)
                 ("guile-redis" ,guile-redis)))
       (native-inputs `(("bash"       ,bash)         ;for the `source' builtin
                        ("pkgconfig"  ,pkg-config)
@@ -844,7 +844,7 @@ (define-public jupyter-guile-kernel
       (inputs
        `(("openssl" ,openssl)
          ("guile" ,guile-2.2)
-         ("guile-json" ,guile-json)
+         ("guile-json" ,guile-json-1)
          ("guile-simple-zmq" ,guile-simple-zmq)))
       (synopsis "Guile kernel for the Jupyter Notebook")
       (description
@@ -1008,7 +1008,7 @@ (define-public guile-mastodon
     (inputs
      `(("guile" ,guile-2.2)
        ("gnutls" ,gnutls)
-       ("guile-json" ,guile-json)))
+       ("guile-json" ,guile-json-1)))
     (home-page "https://framagit.org/prouby/guile-mastodon")
     (synopsis "Guile Mastodon REST API module")
     (description "This package provides Guile modules to access the
diff --git a/gnu/packages/mail.scm b/gnu/packages/mail.scm
index b5555786395cc5e811ba76baa7c0b33d768b7104..8a3f64b10d6ffedaf3f9f2465d48458bf3e89a82 100644
--- a/gnu/packages/mail.scm
+++ b/gnu/packages/mail.scm
@@ -1,5 +1,5 @@
 ;;; GNU Guix --- Functional package management for GNU
-;;; Copyright © 2013, 2014, 2015, 2016, 2017, 2018 Ludovic Courtès <ludo@gnu.org>
+;;; Copyright © 2013, 2014, 2015, 2016, 2017, 2018, 2019 Ludovic Courtès <ludo@gnu.org>
 ;;; Copyright © 2014, 2015, 2017 Mark H Weaver <mhw@netris.org>
 ;;; Copyright © 2014 Ian Denhardt <ian@zenhack.net>
 ;;; Copyright © 2014 Sou Bunnbu <iyzsong@gmail.com>
@@ -2848,7 +2848,7 @@ (define-public mumi
        `(("guile-debbugs" ,guile-debbugs-next)
          ("guile-email" ,guile-email)
          ("guile-fibers" ,guile-fibers)
-         ("guile-json" ,guile-json)
+         ("guile-json" ,guile-json-1)
          ("guile-syntax-highlight" ,guile-syntax-highlight)
          ("guile" ,guile-2.2)))
       (native-inputs
diff --git a/gnu/packages/package-management.scm b/gnu/packages/package-management.scm
index ab1106537982a5a2ed47f871025fa623ef062883..9b2cce0e8fa07dd0ceda5732e539aaa04de92e6d 100644
--- a/gnu/packages/package-management.scm
+++ b/gnu/packages/package-management.scm
@@ -293,7 +293,7 @@ (define (intern tarball)
       (propagated-inputs
        `(("gnutls" ,gnutls)
          ("guile-gcrypt" ,guile-gcrypt)
-         ("guile-json" ,guile-json)
+         ("guile-json" ,guile-json-1)
          ("guile-sqlite3" ,guile-sqlite3)
          ("guile-ssh" ,guile-ssh)
          ("guile-git" ,guile-git)))
@@ -325,7 +325,7 @@ (define-public guix-daemon
     (inputs
      `(("gnutls" ,gnutls)
        ("guile-git" ,guile-git)
-       ("guile-json" ,guile-json)
+       ("guile-json" ,guile-json-1)
        ("guile-gcrypt" ,guile-gcrypt)
        ,@(fold alist-delete (package-inputs guix)
                '("boot-guile" "boot-guile/i686" "util-linux"))))
diff --git a/gnu/packages/web.scm b/gnu/packages/web.scm
index f81d12c7ce8320ebf3b1a3fe4d96029737fc887d..ac6403211c1b90d3a01f3b7cef7cb034ffee212c 100644
--- a/gnu/packages/web.scm
+++ b/gnu/packages/web.scm
@@ -6509,7 +6509,7 @@ (define-public hpcguix-web
       (propagated-inputs
        `(("guile" ,guile-2.2)
          ("guile-commonmark" ,guile-commonmark)
-         ("guile-json" ,guile-json)))
+         ("guile-json" ,guile-json-1)))
       (home-page "https://github.com/UMCUGenetics/hpcguix-web")
       (synopsis "Web interface for cluster deployments of Guix")
       (description "Hpcguix-web provides a web interface to the list of packages