diff --git a/templates/bash.txt b/templates/bash.txt
index 1bf1cf0..c3b33d1 100644
--- a/templates/bash.txt
+++ b/templates/bash.txt
@@ -51,10 +51,10 @@ function __zoxide_hook() {
 {{ NOT_CONFIGURED }}
 
 {%- else %}
-case "${PROMPT_COMMAND}" in
-    *__zoxide_hook*) ;;
-    *) PROMPT_COMMAND="${PROMPT_COMMAND:+${PROMPT_COMMAND};}__zoxide_hook" ;;
-esac
+if [ "${__zoxide_hooked}" != '1' ]; then
+    PROMPT_COMMAND="${PROMPT_COMMAND:+${PROMPT_COMMAND};}__zoxide_hook"
+    __zoxide_hooked='1'
+fi
 
 {%- endif %}
 
diff --git a/templates/posix.txt b/templates/posix.txt
index 41bdd26..e516037 100644
--- a/templates/posix.txt
+++ b/templates/posix.txt
@@ -52,10 +52,10 @@ __zoxide_hook() {
 {{ NOT_CONFIGURED }}
 
 {%- when Hook::Prompt %}
-case "${PS1}" in
-    *\$\(__zoxide_hook\)*) ;;
-    *) PS1="${PS1}\$(__zoxide_hook)" ;;
-esac
+if [ "${__zoxide_hooked}" != '1' ]; then
+    PS1="${PS1}\$(__zoxide_hook)"
+    __zoxide_hooked='1'
+fi
 
 {%- when Hook::Pwd %}
 {{ NOT_CONFIGURED }}
diff --git a/templates/xonsh.txt b/templates/xonsh.txt
index 1e59cf4..ab74f96 100644
--- a/templates/xonsh.txt
+++ b/templates/xonsh.txt
@@ -76,21 +76,21 @@ def __zoxide_errhandler(func):
 #
 
 # Initialize hook to add new entries to the database.
-{%- match hook %}
-{%- when Hook::None %}
-{{ NOT_CONFIGURED }}
+if globals().get("__zoxide_hooked") is not True:
+    globals()["__zoxide_hooked"] = True
 
-{%- when Hook::Prompt %}
-@events.on_post_prompt  # type: ignore  # pylint:disable=undefined-variable
-
-{%- when Hook::Pwd %}
-@events.on_chdir  # type: ignore  # pylint:disable=undefined-variable
-
-{%- endmatch %}
-def __zoxide_hook(**_kwargs):
-    """Hook to add new entries to the database."""
-    pwd = __zoxide_pwd()
-    subprocess.run(["zoxide", "add", pwd], check=False)
+    {% match hook -%}
+    {%- when Hook::None -%}
+    {{ NOT_CONFIGURED }}
+    {%- when Hook::Prompt -%}
+    @events.on_post_prompt  # type: ignore  # pylint:disable=undefined-variable
+    {%- when Hook::Pwd -%}
+    @events.on_chdir  # type: ignore  # pylint:disable=undefined-variable
+    {%- endmatch %}
+    def __zoxide_hook(**_kwargs):
+        """Hook to add new entries to the database."""
+        pwd = __zoxide_pwd()
+        subprocess.run(["zoxide", "add", pwd], check=False)
 
 
 {{ SECTION }}