diff --git a/pkgs/applications/virtualization/OVMF/default.nix b/pkgs/applications/virtualization/OVMF/default.nix
index fcf569a762a..dca29e28cbb 100644
--- a/pkgs/applications/virtualization/OVMF/default.nix
+++ b/pkgs/applications/virtualization/OVMF/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, edk2, nasm, iasl, seabios, openssl, secureBoot ? false }:
+{ stdenv, lib, edk2, nasm, iasl, seabios, openssl, secureBoot ? false }:
 
 let
 
@@ -36,25 +36,24 @@ stdenv.mkDerivation (edk2.setup "OvmfPkg/OvmfPkg${targetArch}.dsc" {
       ln -sv "$file" .
     done
 
-    ${if (seabios == false) then ''
-        ln -sv ${src}/OvmfPkg .
-      '' else ''
+    ${if seabios != null then ''
         cp -r ${src}/OvmfPkg .
         chmod +w OvmfPkg/Csm/Csm16
         cp ${seabios}/Csm16.bin OvmfPkg/Csm/Csm16/Csm16.bin
-      ''}
-
-    ${if (secureBoot == true) then ''
-        ln -sv ${src}/SecurityPkg .
-        ln -sv ${src}/CryptoPkg .
-      '' else ''
-      ''}
-    '';
-
-  buildPhase = if (seabios == false) then ''
-      build ${if secureBoot then "-DSECURE_BOOT_ENABLE=TRUE" else ""}
     '' else ''
-      build -D CSM_ENABLE -D FD_SIZE_2MB ${if secureBoot then "-DSECURE_BOOT_ENABLE=TRUE" else ""}
+        ln -sv ${src}/OvmfPkg .
+    ''}
+
+    ${lib.optionalString secureBoot ''
+      ln -sv ${src}/SecurityPkg .
+      ln -sv ${src}/CryptoPkg .
+    ''}
+  '';
+
+  buildPhase = if seabios == null then ''
+      build ${lib.optionalString secureBoot "-DSECURE_BOOT_ENABLE=TRUE"}
+    '' else ''
+      build -D CSM_ENABLE -D FD_SIZE_2MB ${lib.optionalString secureBoot "-DSECURE_BOOT_ENABLE=TRUE"}
     '';
 
   postFixup = ''
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 0bdff7935bc..40824ac4efc 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -12589,9 +12589,9 @@ with pkgs;
 
   qboot = callPackage ../applications/virtualization/qboot { stdenv = stdenv_32bit; };
 
-  OVMF = callPackage ../applications/virtualization/OVMF { seabios=false; openssl=null; };
-  OVMF-CSM = callPackage ../applications/virtualization/OVMF { openssl=null; };
-  #WIP: OVMF-secureBoot = callPackage ../applications/virtualization/OVMF { seabios=false; secureBoot=true; };
+  OVMF = callPackage ../applications/virtualization/OVMF { seabios = null; openssl = null; };
+  OVMF-CSM = callPackage ../applications/virtualization/OVMF { openssl = null; };
+  #WIP: OVMF-secureBoot = callPackage ../applications/virtualization/OVMF { seabios = null; secureBoot = true; };
 
   seabios = callPackage ../applications/virtualization/seabios { };