diff --git a/config/zsh/.zshrc b/config/zsh/.zshrc
index 07b7746..58c8ee2 100644
--- a/config/zsh/.zshrc
+++ b/config/zsh/.zshrc
@@ -1,12 +1,18 @@
 # Set up zsh for interactive use (options, prompt, aliases, etc.)
 source "$ZDOTDIR/aliases.zsh"
 source "$ZDOTDIR/completion.zsh"
-source "$ZDOTDIR/functions.zsh"
 source "$ZDOTDIR/history.zsh"
 source "$ZDOTDIR/line-editor.zsh"
 source "$ZDOTDIR/man-pages.zsh"
 source "$ZDOTDIR/prompt.zsh"
 
+# Set up autoload for custom functions.
+fpath=("$ZDOTDIR/functions" $fpath)
+for filepath in $ZDOTDIR/functions/*; do
+  autoload "${filepath##*/}"
+done
+unset filepath
+
 # Prevent ctrl-s from freezing the terminal.
 stty stop undef
 
diff --git a/config/zsh/functions.zsh b/config/zsh/functions.zsh
deleted file mode 100644
index e15b6ef..0000000
--- a/config/zsh/functions.zsh
+++ /dev/null
@@ -1,12 +0,0 @@
-# Source: https://unix.stackexchange.com/a/9124
-mkcd() {
-  case "$1" in
-    */..|*/../)                                                       cd -- "$1"  ;;
-    /*/../*)    (cd "${1%/../*}/.."   && mkdir -vp "./${1##*/../}") && cd -- "$1"  ;;
-    /*)                                  mkdir -vp "$1"             && cd    "$1"  ;;
-    */../*)     (cd "./${1%/../*}/.." && mkdir -vp "./${1##*/../}") && cd    "./$1";;
-    ../*)       (cd .. &&                mkdir -vp "${1#.}")        && cd    "$1"  ;;
-    *)                                   mkdir -vp "./$1"           && cd    "./$1";;
-  esac
-}
-
diff --git a/config/zsh/functions/mkcd b/config/zsh/functions/mkcd
new file mode 100644
index 0000000..9661acf
--- /dev/null
+++ b/config/zsh/functions/mkcd
@@ -0,0 +1,10 @@
+# Source: https://unix.stackexchange.com/a/9124
+case "$1" in
+  */..|*/../)                                                        cd -- "$1"  ;;
+  /*/../*)    (cd "${1%/../*}/.."   && mkdir -vp "./${1##*/../}") && cd -- "$1"  ;;
+  /*)                                  mkdir -vp "$1"             && cd    "$1"  ;;
+  */../*)     (cd "./${1%/../*}/.." && mkdir -vp "./${1##*/../}") && cd    "./$1";;
+  ../*)       (cd .. &&                mkdir -vp "${1#.}")        && cd    "$1"  ;;
+  *)                                   mkdir -vp "./$1"           && cd    "./$1";;
+esac
+