diff --git a/.github/workflows/build-bm-toolchain.yaml b/.github/workflows/build-bm-toolchain.yaml
index 9bb4830..881b06a 100644
--- a/.github/workflows/build-bm-toolchain.yaml
+++ b/.github/workflows/build-bm-toolchain.yaml
@@ -23,8 +23,8 @@ jobs:
     - name: "Patch defconfig & configure build"
       working-directory: "build"
       run: |
-          echo CT_LOCAL_TARBALLS_DIR="${{ github.workspace }}/tarballs" >> defconfig
-          echo CT_PREFIX_DIR="\${CT_TOP_DIR}/\${CT_HOST:+HOST-${CT_HOST}/}\${CT_TARGET}" >> defconfig
+          echo CT_LOCAL_TARBALLS_DIR=\"${{ github.workspace }}/tarballs\" >> defconfig
+          echo CT_PREFIX_DIR=\"\${CT_TOP_DIR}/\${CT_HOST:+HOST-${CT_HOST}/}\${CT_TARGET}\" >> defconfig
           echo CT_LOG_PROGRESS_BAR=n >> defconfig
           ct-ng defconfig
     - name: "Tarball cache management"