diff --git a/tests/guix-pack-localstatedir.sh b/tests/guix-pack-localstatedir.sh
index b734b0f..41afda1 100644
--- a/tests/guix-pack-localstatedir.sh
+++ b/tests/guix-pack-localstatedir.sh
@@ -27,8 +27,9 @@ guix pack --version
 # the test in the user's global store if possible, on the grounds that
 # binaries may already be there or can be built or downloaded inexpensively.
 
-NIX_STORE_DIR="`guile -c '(use-modules (guix config))(display %storedir)'`"
+nix_store_dir="`guile -c '(use-modules (guix config))(display %storedir)'`"
 localstatedir="`guile -c '(use-modules (guix config))(display %localstatedir)'`"
+NIX_STORE_DIR="$nix_store_dir"
 GUIX_DAEMON_SOCKET="$localstatedir/guix/daemon-socket/socket"
 export NIX_STORE_DIR GUIX_DAEMON_SOCKET
 
diff --git a/tests/guix-pack-relocatable.sh b/tests/guix-pack-relocatable.sh
index 38dcf1e..b276fdc 100644
--- a/tests/guix-pack-relocatable.sh
+++ b/tests/guix-pack-relocatable.sh
@@ -27,8 +27,9 @@ guix pack --version
 # run it on the user's global store if possible, on the grounds that binaries
 # may already be there or can be built or downloaded inexpensively.
 
-NIX_STORE_DIR="`guile -c '(use-modules (guix config))(display %storedir)'`"
+nix_store_dir="`guile -c '(use-modules (guix config))(display %storedir)'`"
 localstatedir="`guile -c '(use-modules (guix config))(display %localstatedir)'`"
+NIX_STORE_DIR="$nix_store_dir"
 GUIX_DAEMON_SOCKET="$localstatedir/guix/daemon-socket/socket"
 export NIX_STORE_DIR GUIX_DAEMON_SOCKET