diff --git a/.github/workflows/build-and-make.yaml b/.github/workflows/build-and-make.yaml
index 7a91c9b8d..632978e3c 100644
--- a/.github/workflows/build-and-make.yaml
+++ b/.github/workflows/build-and-make.yaml
@@ -495,6 +495,9 @@ jobs:
               # comes from the nightly-version job so every job of this run
               # builds the same version.
               if: needs.nightly-version.outputs.version != ''
+              # Windows runners default to PowerShell, where "${NIGHTLY_VERSION}"
+              # expands to nothing and the script rejects the empty version.
+              shell: bash
               env:
                   NIGHTLY_VERSION: ${{ needs.nightly-version.outputs.version }}
               run: node tools/release/nightly-version.mjs --apply --version "${NIGHTLY_VERSION}"
diff --git a/tools/packaging/configure-linux-frame-copy-build.test.mjs b/tools/packaging/configure-linux-frame-copy-build.test.mjs
index 6ceb14c20..a75b26db3 100644
--- a/tools/packaging/configure-linux-frame-copy-build.test.mjs
+++ b/tools/packaging/configure-linux-frame-copy-build.test.mjs
@@ -479,6 +479,15 @@ test('keeps non-Linux builds independent from the Linux runtime prerequisite', (
     );
     assert.equal(linuxJob.strategy['fail-fast'], false);
     assert.deepEqual(linuxJob.steps, crossPlatformJob.steps);
+    // Windows runners default to PowerShell, where the bash-style
+    // "${NIGHTLY_VERSION}" expands to nothing and the version script rejects
+    // the empty value; the step must pin bash on every host.
+    const applyNightlyVersion = crossPlatformJob.steps.find(
+        (step) => step.name === 'Apply nightly version'
+    );
+    assert.ok(applyNightlyVersion);
+    assert.equal(applyNightlyVersion.shell, 'bash');
+    assert.match(applyNightlyVersion.run, /--version "\$\{NIGHTLY_VERSION\}"/);
     assert.deepEqual(buildWorkflowConfig.jobs['create-release'].needs, [
         'nightly-version',
         'build-cross-platform',