diff --git a/pkgs/misc/uboot/default.nix b/pkgs/misc/uboot/default.nix
index 4d47bb404b579..9f8548709797d 100644
--- a/pkgs/misc/uboot/default.nix
+++ b/pkgs/misc/uboot/default.nix
@@ -57,6 +57,8 @@ let
 
     nativeBuildInputs = [
       ncurses # tools/kwboot
+      libuuid # tools/mkeficapsule
+      gnutls # tools/mkeficapsule
       bc
       bison
       flex
@@ -71,11 +73,7 @@ let
     ];
     depsBuildBuild = [ buildPackages.stdenv.cc ];
 
-    buildInputs = [
-      ncurses # tools/kwboot
-      libuuid # tools/mkeficapsule
-      gnutls # tools/mkeficapsule
-    ];
+    strictDeps = true;
 
     hardeningDisable = [ "all" ];
 
@@ -131,6 +129,13 @@ in {
 
     outputs = [ "out" "man" ];
 
+    buildInputs = [
+      ncurses # tools/kwboot
+      libuuid # tools/mkeficapsule
+      gnutls # tools/mkeficapsule
+      openssl # tools/mkimage
+    ];
+
     postInstall = ''
       installManPage doc/*.1
     '';