diff --git a/pkgs/applications/networking/browsers/opera/default.nix b/pkgs/applications/networking/browsers/opera/default.nix
index 4a8b365c467..6df914cb775 100644
--- a/pkgs/applications/networking/browsers/opera/default.nix
+++ b/pkgs/applications/networking/browsers/opera/default.nix
@@ -29,7 +29,7 @@ stdenv.mkDerivation rec {
   libPath =
     let list = [ stdenv.gcc.gcc glibc qt zlib libX11 libXt libXext libSM libICE];
     in stdenv.lib.makeLibraryPath list
-        + ":" + (if stdenv.system == "x86_64-linux" then stdenv.lib.makeSearchPath "lib64" list else []);
+        + ":" + (if stdenv.system == "x86_64-linux" then stdenv.lib.makeSearchPath "lib64" list else "");
 
   desktopItem = makeDesktopItem {
     name = "Opera";