diff --git a/ci/build.sh b/ci/build.sh
index f818d33..a29754d 100755
--- a/ci/build.sh
+++ b/ci/build.sh
@@ -14,9 +14,9 @@ attic=$(nix build --inputs-from . nixpkgs#attic-client --print-out-paths --no-li
 
 echo "Building packages..."
 out=$(nix build ".#packages.${ARCH}.hello-world" --print-build-logs --print-out-paths --no-link)
-"${attic}" push "${ATTIC_CACHE}" ${out}
+"${attic}" push "${ATTIC_CACHE}" "${out}"
 
 out=$(nix build ".#packages.${ARCH}.xonsh" --print-build-logs --print-out-paths --no-link)
-"${attic}" push "${ATTIC_CACHE}" ${out}
+"${attic}" push "${ATTIC_CACHE}" "${out}"
 
 echo "✅ Build completed for ${ARCH}"