diff --git a/.profile b/.profile
index 46b13d9..c811966 100644
--- a/.profile
+++ b/.profile
@@ -2,7 +2,7 @@
 # Profile file. Runs on login.
 
 # Adds `~/.local/bin` and all subdirectories to $PATH
-export PATH="$PATH:$(du "$HOME/.local/bin/" | cut -f2 | tr '\n' ':' | sed 's/:*$//')"
+export PATH="$PATH:$(du "${HOME}/.local/bin/" | cut -f2 | tr '\n' ':' | sed 's/:*$//')"
 
 export BROWSER="icecat"
 export RTV_BROWSER="qutebrowser"
@@ -13,30 +13,30 @@ export READER="zathura"
 export STATUSBAR="dwmblocks"
 export TERMINAL="st"
 export QT_QPA_PLATFORMTHEME="qt5ct"
-export WINEPREFIX="$HOME/.wine"
+export WINEPREFIX="${HOME}/.wine"
 export JAVA_HOME="/usr/lib/jvm/java-11-openjdk"
 
-export XDG_CACHE_HOME="$HOME/.cache"
-export XDG_CONFIG_HOME="$HOME/.config"
-export XDG_DATA_HOME="$HOME/.local/share"
+export XDG_CACHE_HOME="${HOME}/.cache"
+export XDG_CONFIG_HOME="${HOME}/.config"
+export XDG_DATA_HOME="${HOME}/.local/share"
 
-export ANDROID_SDK_HOME="$XDG_CONFIG_HOME/android"
-export GNUPGHOME="$XDG_CONFIG_HOME/gnupg"
-export GRADLE_USER_HOME="$XDG_CONFIG_HOME/gradle"
-export GTK2_RC_FILES="$XDG_CONFIG_HOME/gtk-2.0/gtkrc-2.0"
-export HISTFILE="$XDG_CACHE_HOME/shhistory"
-export INPUTRC="$XDG_CONFIG_HOME/inputrc"
-export LESSKEY="$XDG_CONFIG_HOME/less/lesskey"
+export ANDROID_SDK_HOME="${XDG_CONFIG_HOME}/android"
+export GNUPGHOME="${XDG_CONFIG_HOME}/gnupg"
+export GRADLE_USER_HOME="${XDG_CONFIG_HOME}/gradle"
+export GTK2_RC_FILES="${XDG_CONFIG_HOME}/gtk-2.0/gtkrc-2.0"
+export HISTFILE="${XDG_CACHE_HOME}/shhistory"
+export INPUTRC="${XDG_CONFIG_HOME}/inputrc"
+export LESSKEY="${XDG_CONFIG_HOME}/less/lesskey"
 export LESSHISTFILE="-"
 export ncmpcpp_directory="-"
-export NOTMUCH_CONFIG="$XDG_CONFIG_HOME/notmuch-config"
-export NPM_CONFIG_USERCONFIG="$XDG_CONFIG_HOME/npm/npmrc"
-export NUGET_PACKAGES="$XDG_CACHE_HOME/nugetpackages"
-export PASSWORD_STORE_DIR="$XDG_DATA_HOME/pass"
-export SUDO_ASKPASS="$HOME/.local/bin/tools/dmenupass"
-export TMUX_TMPDIR="$XDG_CACHE_HOME/tmux"
-export WGETRC="$XDG_CONFIG_HOME/wgetrc"
-export ZDOTDIR="$XDG_CONFIG_HOME/zsh"
+export NOTMUCH_CONFIG="${XDG_CONFIG_HOME}/notmuch-config"
+export NPM_CONFIG_USERCONFIG="${XDG_CONFIG_HOME}/npm/npmrc"
+export NUGET_PACKAGES="${XDG_CACHE_HOME}/nugetpackages"
+export PASSWORD_STORE_DIR="${XDG_DATA_HOME}/pass"
+export SUDO_ASKPASS="${HOME}/.local/bin/tools/dmenupass"
+export TMUX_TMPDIR="${XDG_CACHE_HOME}/tmux"
+export WGETRC="${XDG_CONFIG_HOME}/wgetrc"
+export ZDOTDIR="${XDG_CONFIG_HOME}/zsh"
 export _JAVA_AWT_WM_NONREPARENTING=1
 
 # less/man colors
@@ -49,8 +49,8 @@ export LESS_TERMCAP_se="$(printf '%b' '')"; a="${a%_}"
 export LESS_TERMCAP_us="$(printf '%b' '')"; a="${a%_}"
 export LESS_TERMCAP_ue="$(printf '%b' '')"; a="${a%_}"
 
-echo "$0" | grep "bash$" >/dev/null && [ -f ~/.bashrc ] && source "$HOME/.bashrc"
-echo "$0" | grep "zsh$" >/dev/null && [ -f $ZDOTDIR/.zshrc ] && source "$ZDOTDIR/.zshrc"
+echo "$0" | grep "bash$" >/dev/null && [ -f ~/.bashrc ] && source "${HOME}/.bashrc"
+echo "$0" | grep "zsh$" >/dev/null && [ -f ${ZDOTDIR}/.zshrc ] && source "${ZDOTDIR}/.zshrc"
 
 # Start graphical server if not already running.
 [ "$(tty)" = "/dev/tty1" ] && ! pgrep -x Xorg >/dev/null && exec startx