diff --git a/pkgs/system/all-packages-generic.nix b/pkgs/system/all-packages-generic.nix
index 06b8eb45ebe..08e6c3962a7 100644
--- a/pkgs/system/all-packages-generic.nix
+++ b/pkgs/system/all-packages-generic.nix
@@ -620,7 +620,7 @@ rec {
 
   sdf = (import ../development/tools/parsing/sdf) {
     inherit fetchurl stdenv getopt;
-    aterm =  (import ../development/libraries/aterm/aterm-2.3.1) {
+    aterm =  (import ../development/libraries/aterm/aterm-2.3.1.nix) {
       inherit fetchurl stdenv;
     };
   };