diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 219055427..36a7dd8ca 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -15,6 +15,7 @@ jobs:
           - ubuntu-latest
         arch:
           - x64
+          - x86
     steps:
       - uses: actions/checkout@v2
       - uses: julia-actions/setup-julia@v1
diff --git a/NEWS.md b/NEWS.md
index a310f4a20..b02ac62cc 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -12,6 +12,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Fixed
  - Bug-fix for 32-bit Julia: Replace all occurences of Int64 by Int. Since PR [#445](https://github.com/gridap/Gridap.jl/pull/445).
+ - Bug-fix for 32-bit Julia. Using inttype=Int keyword argument for JSON parsing. Since PR [#456](https://github.com/gridap/Gridap.jl/pull/456).
 
 ## [0.14.1] - 2020-09-17 
 
diff --git a/src/Io/Json.jl b/src/Io/Json.jl
index 1c199ae8b..0831f95f7 100644
--- a/src/Io/Json.jl
+++ b/src/Io/Json.jl
@@ -3,7 +3,7 @@
     from_json(::Type{T},s::AbstractString) where T
 """
 function from_json(::Type{T},s::AbstractString) where T
-  json_dict = JSON.parse(s)
+  json_dict = JSON.parse(s;inttype=Int)
   dict = _decode_json_dict(json_dict)
   from_dict(T,dict)
 end
@@ -12,7 +12,7 @@ end
     from_json_file(::Type{T},s::AbstractString) where T
 """
 function from_json_file(::Type{T},s::AbstractString) where T
-  json_dict = JSON.parsefile(s)
+  json_dict = JSON.parsefile(s;inttype=Int)
   dict = _decode_json_dict(json_dict)
   from_dict(T,dict)
 end