diff --git a/nix/bcachefs.rev.sha256 b/nix/bcachefs.rev.sha256
new file mode 100644
index 00000000..728778ad
--- /dev/null
+++ b/nix/bcachefs.rev.sha256
@@ -0,0 +1 @@
+sha256-cK2GKfn3VKd08S2a1FPSvG2+WT4iVXsa6m+/1jFlTMA=
\ No newline at end of file
diff --git a/nix/overlay.nix b/nix/overlay.nix
index 9c33396f..42d3fb25 100644
--- a/nix/overlay.nix
+++ b/nix/overlay.nix
@@ -22,7 +22,7 @@ final: prev: {
 		kernel = final.callPackage ./bcachefs-kernel.nix {
 			commit = final.bcachefs.tools.bcachefs_revision;
 			# This needs to be recalculated for every revision change
-			sha256 = "sha256-XSA0dBZZL8RXplgjpoLOFSULM8t/0Ztz8xlhLn9hdyw=";
+			sha256 = builtins.readFile ./bcachefs.rev.sha256;
 			kernelPatches = [];
 		};
 	};