diff --git a/forgit.plugin.zsh b/forgit.plugin.zsh
index 10e9828..4c81c7d 100755
--- a/forgit.plugin.zsh
+++ b/forgit.plugin.zsh
@@ -5,7 +5,11 @@ forgit::warn() { printf "%b[Warn]%b %s\n" '\e[0;33m' '\e[0m' "$@" >&2; }
 
 # set installation path
 if [[ -n "$ZSH_VERSION" ]]; then
-    FORGIT_INSTALL_DIR="$( dirname -- "$0")"
+    # shellcheck disable=2277,2296,2299
+    0="${ZERO:-${${0:#$ZSH_ARGZERO}:-${(%):-%N}}}"
+    # shellcheck disable=2277,2296,2298
+    0="${${(M)0:#/*}:-$PWD/$0}"
+    FORGIT_INSTALL_DIR="${0:h}"
 elif [[ -n "$BASH_VERSION" ]]; then
     FORGIT_INSTALL_DIR="$(dirname -- "${BASH_SOURCE[0]}")"
 else