diff --git a/modules/programs/nix-index.nix b/modules/programs/nix-index.nix
index 49f4b52e..cdf3151c 100644
--- a/modules/programs/nix-index.nix
+++ b/modules/programs/nix-index.nix
@@ -48,7 +48,7 @@ in {
     '';
 
     # See https://github.com/bennofs/nix-index/issues/126
-    programs.fish.shellInit = let
+    programs.fish.interactiveShellInit = let
       wrapper = pkgs.writeScript "command-not-found" ''
         #!${pkgs.bash}/bin/bash
         source ${cfg.package}/etc/profile.d/command-not-found.sh