diff --git a/modules/programs/bash/bash.nix b/modules/programs/bash/bash.nix
index f7ac48ccb28..38ed7c7a186 100644
--- a/modules/programs/bash/bash.nix
+++ b/modules/programs/bash/bash.nix
@@ -30,12 +30,14 @@ in
         # should go into this script.
         source = pkgs.substituteAll {
           src = ./bashrc.sh;
+
+          bash = pkgs.bash;
           systemPath = config.system.path;
           wrapperDir = config.security.wrapperDir;
           modulesTree = config.system.modulesTree;
           shellInit = config.environment.shellInit;
         };
-        target = "bashrc";      
+        target = "bashrc";
       }
 
       { # Script executed when the shell starts as a login shell.
diff --git a/modules/programs/bash/bashrc.sh b/modules/programs/bash/bashrc.sh
index b180d352fdb..b09e3230a5d 100644
--- a/modules/programs/bash/bashrc.sh
+++ b/modules/programs/bash/bashrc.sh
@@ -61,3 +61,13 @@ alias ll="ls -l"
 alias l="ls -alh"
 alias which="type -p"
 
+# Completion.
+if [ -d "@bash@/etc/bash_completion.d" ]
+then
+    export BASH_COMPLETION_DIR="@bash@/etc/bash_completion.d"
+fi
+if [ -f "@bash@/etc/bash_completion" ]
+then
+    export BASH_COMPLETION="@bash@/etc/bash_completion"
+    source "$BASH_COMPLETION"
+fi