diff --git a/pkgs/servers/firebird/default.nix b/pkgs/servers/firebird/default.nix
index abd40fef2139..8ae4196b0f5a 100644
--- a/pkgs/servers/firebird/default.nix
+++ b/pkgs/servers/firebird/default.nix
@@ -79,7 +79,8 @@ let base = {
       hash = "sha256-OxkPpmnYTl65ns+hKHJd5IAPUiMj0g3HUpyRpwDNut8=";
     };
 
-    buildInputs = base.buildInputs ++ [ zlib unzip libtommath libtomcrypt ];
+    nativeBuildInputs = base.nativeBuildInputs ++ [ unzip ];
+    buildInputs = base.buildInputs ++ [ zlib libtommath libtomcrypt ];
   });
 
   firebird = firebird_4;