diff --git a/pkgs/by-name/li/libkrun/package.nix b/pkgs/by-name/li/libkrun/package.nix
index 71ff653b002e..610c757bb7ac 100644
--- a/pkgs/by-name/li/libkrun/package.nix
+++ b/pkgs/by-name/li/libkrun/package.nix
@@ -13,6 +13,7 @@
   virglrenderer,
   libkrunfw,
   rustc,
+  withBlk ? false,
   withGpu ? false,
   withSound ? false,
   withNet ? false,
@@ -65,6 +66,7 @@ stdenv.mkDerivation (finalAttrs: {
     [
       "PREFIX=${placeholder "out"}"
     ]
+    ++ lib.optional withBlk "BLK=1"
     ++ lib.optional withGpu "GPU=1"
     ++ lib.optional withSound "SND=1"
     ++ lib.optional withNet "NET=1"