diff --git a/dev/tasks/r/github.packages.yml b/dev/tasks/r/github.packages.yml
index 35be2acbd9bf..c640629a8d03 100644
--- a/dev/tasks/r/github.packages.yml
+++ b/dev/tasks/r/github.packages.yml
@@ -133,7 +133,7 @@ jobs:
       - name: Build libarrow
         shell: bash
         env:
-          ARCH: {{ "${{ matrix.arch == 'x86_64' && 'amd64' || 'arm64v8' }}" }}
+          ARCH: {{ "${{ matrix.arch == 'x86_64' && 'amd64' || 'arm64/v8' }}" }}
           UBUNTU: {{ '${{ matrix.ubuntu }}' }}
         {{ macros.github_set_sccache_envvars()|indent(8) }}
         run: |