diff --git a/filesystems.nix b/filesystems.nix
index 7473286..34cb87f 100644
--- a/filesystems.nix
+++ b/filesystems.nix
@@ -119,6 +119,12 @@ in
     };
 
     boot.tmpOnTmpfs = true;
+    boot.tmpOnTmpfsSize =
+      let
+        hasSwap = length config.swapDevices > 0;
+      in
+        if hasSwap then "150%" else "75%"
+      ;
 
     services.smartd = {
       enable = mkDefault true;