diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 84bb684..97be514 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -7,7 +7,6 @@ on:
 
 env:
   CARGO_TERM_COLOR: always
-  CARGO_HOME: build/cargo-home
   CARGO_TARGET_DIR: ${{ github.workspace }}/build/target
 
 jobs:
@@ -19,6 +18,12 @@ jobs:
     steps:
       - uses: actions/checkout@v2
 
+      # Set CARGO_HOME outside the workspace so that Swatinem/rust-cache (below)
+      # does not consider it workspace local and thus not a dependency to cache.
+      # runner.temp is not valid in 'env:' above, so have to set it here.
+      - name: Set CARGO_HOME
+        run: echo "CARGO_HOME=${{ runner.temp }}/cargo-home" >> "$GITHUB_ENV"
+
       - run: rustup show active-toolchain
       - run: rustup component add rustfmt clippy
 
@@ -72,7 +77,7 @@ jobs:
           echo ~/.local/bin >> $GITHUB_PATH
 
       - name: Setup meson project
-        run: meson setup -Dprofile=development -Dcargo_locked=true build
+        run: meson setup -Dprofile=development -Dcargo_locked=true -Dcargo_home="$CARGO_HOME" build
 
       - name: Build
         run: ninja -C build