diff --git a/tests/installers.sh b/tests/installers.sh
index f2b89d4..2ad17cb 100755
--- a/tests/installers.sh
+++ b/tests/installers.sh
@@ -214,6 +214,26 @@ HOME="$pyenv_env_home" XDG_CONFIG_HOME="$pyenv_env_xdg" \
     zsh -lc '[[ "$(command -v python3)" == "$HOME/.pyenv/shims/python3" ]]' ||
     fail "pyenv Python is not restored in login zsh after the system profile"
 
+# Interactive initialization runs once while repeated sourcing restores PATH.
+mkdir -p "$pyenv_env_home/.pyenv/bin"
+cat >"$pyenv_env_home/.pyenv/bin/pyenv" <<'PYENV'
+#!/bin/sh
+printf '%s\n' "$*" >> "$PYENV_ROOT/init-calls"
+printf '%s\n' 'pyenv() { command pyenv "$@"; }'
+PYENV
+chmod +x "$pyenv_env_home/.pyenv/bin/pyenv"
+HOME="$pyenv_env_home" PYENV_ROOT="$pyenv_env_home/.pyenv" PATH=/usr/bin:/bin \
+    zsh -dfic '
+        source "$1"
+        (( $+functions[pyenv] )) || exit 1
+        path=(/usr/bin /bin)
+        source "$1"
+        [[ $(command -v python3) == "$PYENV_ROOT/shims/python3" ]]
+    ' zsh "$ROOT/zsh/pyenv.zsh" ||
+    fail "interactive pyenv initialization did not preserve its function and Python PATH"
+printf '%s\n' 'init - --no-rehash zsh' | cmp -s - "$pyenv_env_home/.pyenv/init-calls" ||
+    fail "pyenv initialization must run once without a startup rehash"
+
 # A later easyzsh migration must not move the login hook before the system profile.
 HOME="$pyenv_env_home" bash "$ROOT/deploy.sh" --home "$pyenv_env_home" --migrate-zprofile >/dev/null
 grep -Fqx "$pyenv_login_hook" "$pyenv_env_home/.zprofile" ||
diff --git a/zsh/pyenv.zsh b/zsh/pyenv.zsh
index e282e79..d721231 100644
--- a/zsh/pyenv.zsh
+++ b/zsh/pyenv.zsh
@@ -3,6 +3,8 @@ export PYENV_ROOT="${PYENV_ROOT:-$HOME/.pyenv}"
 [[ -d "$PYENV_ROOT/bin" ]] && path=("$PYENV_ROOT/bin" ${path:#$PYENV_ROOT/bin})
 [[ -d "$PYENV_ROOT/shims" ]] && path=("$PYENV_ROOT/shims" ${path:#$PYENV_ROOT/shims})
 export PATH
-if [[ -o interactive ]] && command -v pyenv &> /dev/null; then
-  eval "$(pyenv init - zsh)"
+# Login profiles can reapply PATH without repeating shell integration.
+# Run `pyenv rehash` after installing entry points through `python -m pip`.
+if [[ -o interactive ]] && (( ! $+functions[pyenv] )) && command -v pyenv &> /dev/null; then
+  eval "$(pyenv init - --no-rehash zsh)"
 fi