diff --git a/scripts/cache-node.sh b/scripts/cache-node.sh
index 70c4f46..7c1484f 100755
--- a/scripts/cache-node.sh
+++ b/scripts/cache-node.sh
@@ -3,6 +3,9 @@ set -o nounset
 set -o pipefail
 shopt -s lastpipe
 
+# Remove the `nixpkgs=` default input.
+export NIX_PATH="nixpkgs="
+
 system_type="$(colmena eval -E "{ nodes, ... }: nodes.${BUILD_NODE}.config.deployment.systemType" --show-trace)"
 # Get rid of surrounding quotes.
 system_type="${system_type%\"}"