diff --git a/pkgs/build-support/docker/default.nix b/pkgs/build-support/docker/default.nix
index 8d47f1570138..6efb447e1424 100644
--- a/pkgs/build-support/docker/default.nix
+++ b/pkgs/build-support/docker/default.nix
@@ -200,7 +200,7 @@ rec {
       # Unpack all of the parent layers into the image.
       lowerdir=""
       extractionID=0
-      for layerTar in $(cat layer-list); do
+      for layerTar in $(tac layer-list); do
         echo "Unpacking layer $layerTar"
         extractionID=$((extractionID + 1))