diff --git a/gitlab/README b/gitlab/README
index b04a3c8f..ef4d0bed 100644
--- a/gitlab/README
+++ b/gitlab/README
@@ -11,10 +11,10 @@ testing, and uploads it to the GitLab container registry. The Docker
 script is in the file image.docker.
 
 The file build.yml contains the actual testing targets. Currently
-vkd3d is tested on Linux x86-64, with two different Vulkan drivers
-(both from Mesa): llvmpipe (a software implementation) and RADV (a
-hardware implementation backed by an AMD GPU). The testing logs are
-available as CI artifacts.
+vkd3d is tested on Linux, on x86-64 and i386, each architecture with
+two different Vulkan drivers (both from Mesa): llvmpipe (a software
+implementation) and RADV (a hardware implementation backed by an AMD
+GPU). The testing logs are available as CI artifacts.
 
 Some custom runner configuration is required in order to run the tests
 on an AMD GPU. Specifically, a runner tagged with `amd-gpu' must be
diff --git a/gitlab/build.yml b/gitlab/build.yml
index c10d64a6..780d645b 100644
--- a/gitlab/build.yml
+++ b/gitlab/build.yml
@@ -25,15 +25,30 @@
     paths:
       - artifacts
 
-build-radv:
+build-radv-64:
   extends: .build
   tags:
     - amd-gpu
   variables:
     VK_LOADER_DRIVERS_SELECT: 'radeon_*'
 
-build-llvmpipe:
+build-llvmpipe-64:
   extends: .build
   allow_failure: true
   variables:
     VK_LOADER_DRIVERS_SELECT: 'lvp_*'
+
+build-radv-32:
+  extends: .build
+  tags:
+    - amd-gpu
+  variables:
+    VK_LOADER_DRIVERS_SELECT: 'radeon_*'
+    CC: 'gcc -m32'
+
+build-llvmpipe-32:
+  extends: .build
+  allow_failure: true
+  variables:
+    VK_LOADER_DRIVERS_SELECT: 'lvp_*'
+    CC: 'gcc -m32'