diff --git a/nix/overlays/ghostty-dev.nix b/nix/overlays/ghostty-dev.nix
index 599c6542..153bf5d9 100644
--- a/nix/overlays/ghostty-dev.nix
+++ b/nix/overlays/ghostty-dev.nix
@@ -1,7 +1,20 @@
 let
   sources = import ../../npins;
 in
-final: prev: {
+final: prev:
+let
+  inherit (final) lib;
+in
+{
   # Dev version of ghostty, "tip"
-  ghostty = sources.ghostty-dev.asFlake.packages.${final.stdenv.hostPlatform.system}.default;
+  ghostty =
+    let
+      shortRev = lib.substring 0 8 sources.ghostty-dev.revision;
+    in
+    # NOTE:
+    # ghostty-dev internally builds a derivation used as a cache.
+    # Overriding the pname would cause cash mismatch.
+    sources.ghostty-dev.asFlake.packages.${final.stdenv.hostPlatform.system}.default.override {
+      revision = shortRev;
+    };
 }