diff --git a/pkgs/os-specific/linux/kernel/manual-config.nix b/pkgs/os-specific/linux/kernel/manual-config.nix
index a9f0b8f052b..2234a76dbf8 100644
--- a/pkgs/os-specific/linux/kernel/manual-config.nix
+++ b/pkgs/os-specific/linux/kernel/manual-config.nix
@@ -71,7 +71,7 @@ let
   isModular = config.isYes "MODULES";
 
   installsFirmware = (config.isEnabled "FW_LOADER") &&
-    (isModular || (config.isNo "FIRMWARE_IN_KERNEL"));
+    (isModular || (config.isDisabled "FIRMWARE_IN_KERNEL"));
 in
 
 stdenv.mkDerivation {