diff --git a/nix/build.nix b/nix/build.nix
index d96a7e51ca08d23572b01f0c387d6ef9e4f2dd70..a5ced61bbbfd145c1e3f9fc9909ae69779ba133a 100644
--- a/nix/build.nix
+++ b/nix/build.nix
@@ -224,7 +224,7 @@ let
         };
         ZED_UPDATE_EXPLANATION = "Zed has been installed using Nix. Auto-updates have thus been disabled.";
         RELEASE_VERSION = version;
-        ZED_COMMIT_SHA = commitSha;
+        ZED_COMMIT_SHA = lib.optionalString (commitSha != null) "${commitSha}";
         LK_CUSTOM_WEBRTC = pkgs.callPackage ./livekit-libwebrtc/package.nix { };
         PROTOC = "${protobuf}/bin/protoc";