diff --git a/bin/touchid.sh b/bin/touchid.sh
index 94825f0..4dce339 100755
--- a/bin/touchid.sh
+++ b/bin/touchid.sh
@@ -16,8 +16,10 @@ source "$LIB_DIR/core/common.sh"
 # Set up global cleanup trap
 trap cleanup_temp_files EXIT INT TERM
 
-readonly PAM_SUDO_FILE="${MOLE_PAM_SUDO_FILE:-/etc/pam.d/sudo}"
-readonly PAM_SUDO_LOCAL_FILE="${MOLE_PAM_SUDO_LOCAL_FILE:-/etc/pam.d/sudo_local}"
+PAM_SUDO_FILE="${MOLE_PAM_SUDO_FILE:-/etc/pam.d/sudo}"
+PAM_SUDO_LOCAL_FILE="${MOLE_PAM_SUDO_LOCAL_FILE:-$(dirname "$PAM_SUDO_FILE")/sudo_local}"
+readonly PAM_SUDO_FILE
+readonly PAM_SUDO_LOCAL_FILE
 readonly PAM_TID_LINE="auth       sufficient     pam_tid.so"
 
 # Check if Touch ID is already configured