diff --git a/pkgs/os-specific/linux/kernel/manual-config.nix b/pkgs/os-specific/linux/kernel/manual-config.nix
index 49880e0ecdd..091855a1652 100644
--- a/pkgs/os-specific/linux/kernel/manual-config.nix
+++ b/pkgs/os-specific/linux/kernel/manual-config.nix
@@ -74,7 +74,7 @@ let
 
       installsFirmware = (config.isEnabled "FW_LOADER") &&
         (isModular || (config.isDisabled "FIRMWARE_IN_KERNEL"));
-    in (optionalAttrs isModular { outputs = [ "out" "dev" ]; }) // {
+    in (optionalAttrs isModular { outputs = [ "out" "dev" ]; propagatedOutputs = ""; }) // {
       passthru = {
         inherit version modDirVersion config kernelPatches;
       };