diff --git a/modules/environment/impermanence.nix b/modules/environment/impermanence.nix
index b7e7f7f3..5f1a75bc 100644
--- a/modules/environment/impermanence.nix
+++ b/modules/environment/impermanence.nix
@@ -55,7 +55,7 @@ with lib; {
             btrfs subvolume delete "$1"
           }
 
-          for i in $(find /btrfs_tmp/old_roots/ -maxdepth 1 -mtime +30); do
+          for i in $(find /btrfs_tmp/old_roots/ -maxdepth 1 -atime +30); do
             delete_subvolume_recursively "$i"
           done
 
diff --git a/modules/environment/user-impermanence.nix b/modules/environment/user-impermanence.nix
index 99a329ad..61f94f08 100644
--- a/modules/environment/user-impermanence.nix
+++ b/modules/environment/user-impermanence.nix
@@ -65,7 +65,7 @@ with lib; {
                 ${pkgs.btrfs-progs}/bin/btrfs subvolume delete "$1"
               }
 
-              for i in $(find /persistent/old-homedirs/${name} -maxdepth 1 -mtime +30); do
+              for i in $(find /persistent/old-homedirs/${name} -maxdepth 1 -atime +30); do
                 delete_subvolume_recursively "$i"
               done