diff --git a/lib/src/dag/default.test.nix b/lib/src/dag/default.test.nix
index 5c13cd9..62453e0 100644
--- a/lib/src/dag/default.test.nix
+++ b/lib/src/dag/default.test.nix
@@ -149,7 +149,7 @@ in
           ];
           actual = lib.dag.sort.topological {
             a = lib.dag.entry.anywhere "a";
-            b = lib.dag.entry.between [ "c" ] [ "a" ] "b";
+            b = lib.dag.entry.between [ "a" ] [ "c" ] "b";
             c = lib.dag.entry.before [ "c" ] "c";
             d = lib.dag.entry.after [ "c" ] "d";
           };