diff --git a/nixos/modules/programs/zsh/zsh.nix b/nixos/modules/programs/zsh/zsh.nix
index 930cc1987a33..049a315c7622 100644
--- a/nixos/modules/programs/zsh/zsh.nix
+++ b/nixos/modules/programs/zsh/zsh.nix
@@ -135,6 +135,13 @@ in
         type = types.bool;
       };
 
+      enableBashCompletion = mkOption {
+        default = false;
+        description = ''
+          Enable compatibility with bash's programmable completion system.
+        '';
+        type = types.bool;
+      };
 
       enableGlobalCompInit = mkOption {
         default = cfg.enableCompletion;
@@ -239,6 +246,11 @@ in
           autoload -U compinit && compinit
         ''}
 
+        ${optionalString cfg.enableBashCompletion ''
+          # Enable compatibility with bash's completion system.
+          autoload -U bashcompinit && bashcompinit
+        ''}
+
         # Setup custom interactive shell init stuff.
         ${cfge.interactiveShellInit}