diff --git a/modules/installer/tools/nixos-install.sh b/modules/installer/tools/nixos-install.sh
index 5b7746b6162..e55955db7c4 100644
--- a/modules/installer/tools/nixos-install.sh
+++ b/modules/installer/tools/nixos-install.sh
@@ -6,7 +6,7 @@
 # - register validity
 # - with a chroot to the target device:
 #   * do a nix-pull
-#   * nix-env -p /nix/var/nix/profiles/system -i <nix-expr for the configuration>
+#   * nix-env -p @stateDir@/nix/profiles/system -i <nix-expr for the configuration>
 #   * run the activation script of the configuration (also installs Grub)
 
 set -e
@@ -92,16 +92,16 @@ mkdir -m 0755 -p $mountPoint/var
 # Create the necessary Nix directories on the target device, if they
 # don't already exist.
 mkdir -m 0755 -p \
-    $mountPoint/nix/var/nix/gcroots \
-    $mountPoint/nix/var/nix/temproots \
-    $mountPoint/nix/var/nix/manifests \
-    $mountPoint/nix/var/nix/userpool \
-    $mountPoint/nix/var/nix/profiles \
-    $mountPoint/nix/var/nix/db \
-    $mountPoint/nix/var/log/nix/drvs
+    $mountPoint@stateDir@/nix/gcroots \
+    $mountPoint@stateDir@/nix/temproots \
+    $mountPoint@stateDir@/nix/manifests \
+    $mountPoint@stateDir@/nix/userpool \
+    $mountPoint@stateDir@/nix/profiles \
+    $mountPoint@stateDir@/nix/db \
+    $mountPoint@stateDir@/log/nix/drvs
 
 mkdir -m 1777 -p \
-    $mountPoint/nix/store \
+    $mountPoint@storeDir@ \
 
 
 # Get the store paths to copy from the references graph.
@@ -112,7 +112,7 @@ storePaths=$(@perl@/bin/perl @pathsFromGraph@ @nixClosure@)
 echo "copying Nix to $mountPoint...."
 for i in $storePaths; do
     echo "  $i"
-    rsync -a $i $mountPoint/nix/store/
+    rsync -a $i $mountPoint@storeDir@/
 done
 
 
@@ -154,7 +154,7 @@ fi
 # it into the system configuration profile.
 echo "building the system configuration..."
 NIXPKGS=/mnt/etc/nixos/nixpkgs chroot $mountPoint @nix@/bin/nix-env \
-    -p /nix/var/nix/profiles/system \
+    -p @stateDir@/nix/profiles/system \
     -f "/mnt$NIXOS" \
     --set -A system
 
@@ -196,4 +196,4 @@ touch $mountPoint/etc/NIXOS
 # configuration.
 echo "finalising the installation..."
 NIXOS_INSTALL_GRUB=1 chroot $mountPoint \
-    /nix/var/nix/profiles/system/bin/switch-to-configuration boot
+    @stateDir@/nix/profiles/system/bin/switch-to-configuration boot
diff --git a/modules/installer/tools/nixos-rebuild.sh b/modules/installer/tools/nixos-rebuild.sh
index 90df386faa9..4da87c5f9b1 100644
--- a/modules/installer/tools/nixos-rebuild.sh
+++ b/modules/installer/tools/nixos-rebuild.sh
@@ -133,9 +133,9 @@ if test -n "$pullManifest"; then
     manifests=$(nix-instantiate --eval-only --xml --strict $NIXOS -A manifests \
         | grep '<string'  | sed 's^.*"\(.*\)".*^\1^g')
 
-    mkdir -p /nix/var/nix/channel-cache
+    mkdir -p @stateDir@/nix/channel-cache
     for i in $manifests; do
-        NIX_DOWNLOAD_CACHE=/nix/var/nix/channel-cache nix-pull $i || true
+        NIX_DOWNLOAD_CACHE=@stateDir@/nix/channel-cache nix-pull $i || true
     done
 fi
 
@@ -162,8 +162,8 @@ fi
 if test -z "$rollback"; then
     echo "building the system configuration..." >&2
     if test "$action" = switch -o "$action" = boot; then
-        nix-env -p /nix/var/nix/profiles/system -f $NIXOS --set -A system $extraBuildFlags
-        pathToConfig=/nix/var/nix/profiles/system
+        nix-env -p @stateDir@/nix/profiles/system -f $NIXOS --set -A system $extraBuildFlags
+        pathToConfig=@stateDir@/nix/profiles/system
     elif test "$action" = test -o "$action" = build -o "$action" = dry-run; then
         nix-build $NIXOS -A system -K -k $extraBuildFlags > /dev/null
         pathToConfig=./result
@@ -178,14 +178,14 @@ if test -z "$rollback"; then
     fi
 else # test -n "$rollback"
     if test "$action" = switch -o "$action" = boot; then
-        nix-env --rollback -p /nix/var/nix/profiles/system
-        pathToConfig=/nix/var/nix/profiles/system
+        nix-env --rollback -p @stateDir@/nix/profiles/system
+        pathToConfig=@stateDir@/nix/profiles/system
     elif test "$action" = test -o "$action" = build; then
         systemNumber=$(
-            nix-env -p /nix/var/nix/profiles/system --list-generations |
+            nix-env -p @stateDir@/nix/profiles/system --list-generations |
             sed -n '/current/ {g; p;}; s/ *\([0-9]*\).*/\1/; h'
         )
-        ln -sT /nix/var/nix/profiles/system-${systemNumber}-link ./result
+        ln -sT @stateDir@/nix/profiles/system-${systemNumber}-link ./result
         pathToConfig=./result
     else
         showSyntax