diff --git a/infra/cross/build-linux.sh b/infra/cross/build-linux.sh
index 003fab4cd..c45fcf6f6 100755
--- a/infra/cross/build-linux.sh
+++ b/infra/cross/build-linux.sh
@@ -17,6 +17,11 @@ REPO="$(cd "$HERE/../.." && pwd)"
 NODE_SRC="${NODE_SRC:-$REPO/vendor/igneum-node-v4}"
 TARGET_DIR="${TARGET_DIR:-$REPO/vendor/igneum-node/target-linux}"
 OUT_DIR="${OUT_DIR:-$HERE/out}"
+# Every path absolute before the cd into NODE_SRC (5 October 2026, the 0.3.10 cut: a relative TARGET_DIR was resolved by
+# cargo inside the node worktree, the copy below read the repository-relative one, and the seed's "new" binary was the
+# previous build's bytes, twice).
+abs() { case "$1" in /*) printf '%s' "$1" ;; *) printf '%s/%s' "$PWD" "$1" ;; esac; }
+NODE_SRC="$(abs "$NODE_SRC")"; TARGET_DIR="$(abs "$TARGET_DIR")"; OUT_DIR="$(abs "$OUT_DIR")"
 TARGET="${TARGET:-x86_64-unknown-linux-gnu}"
 GLIBC="${GLIBC:-2.36}"
 JOBS="${JOBS:-4}"