diff --git a/gdscript-customization.el b/gdscript-customization.el
index 853a3e1..e4841ed 100644
--- a/gdscript-customization.el
+++ b/gdscript-customization.el
@@ -58,19 +58,6 @@
   :type 'integer
   :safe 'integerp)
 
-(defcustom gdscript-indent-guess-indent-offset
-  t "If t, tells GDScript mode to guess `gdscript-indent-offset' value."
-  :type 'boolean
-  :group 'gdscript
-  :safe 'booleanp)
-
-(defcustom gdscript-indent-guess-indent-offset-verbose
-  t "If t, emit a warning when guessing indentation fails."
-  :version "25.1"
-  :type 'boolean
-  :group 'gdscript
-  :safe 'booleanp)
-
 (defcustom gdscript-indent-trigger-commands '(indent-for-tab-command yas-expand yas/expand)
   "Commands that might trigger a `gdscript-indent-line' call."
   :type '(repeat symbol):group'gdscript)
diff --git a/gdscript-indent-and-nav.el b/gdscript-indent-and-nav.el
index 848c71a..4f04e50 100644
--- a/gdscript-indent-and-nav.el
+++ b/gdscript-indent-and-nav.el
@@ -45,45 +45,6 @@
 The name of the defun should be grouped so it can be retrieved
 via `match-string'.")
 
-;;; Indentation
-(defun gdscript-indent-guess-indent-offset ()
-  "Guess and set `gdscript-indent-offset' for the current buffer."
-  (interactive)
-  (save-excursion
-    (save-restriction
-      (widen)
-      (goto-char (point-min))
-      (let ((block-end))
-        (while (and (not block-end)
-                    (re-search-forward
-                     (gdscript-rx line-start block-start) nil t))
-          (when (and
-                 (not (gdscript-syntax-context-type))
-                 (progn
-                   (goto-char (line-end-position))
-                   (gdscript--util-forward-comment -1)
-                   (if (equal (char-before) ?:)
-                       t
-                     (forward-line 1)
-                     (when (gdscript-info-block-continuation-line-p)
-                       (while (and (gdscript-info-continuation-line-p)
-                                   (not (eobp)))
-                         (forward-line 1))
-                       (gdscript--util-forward-comment -1)
-                       (when (equal (char-before) ?:)
-                         t)))))
-            (setq block-end (point-marker))))
-        (let ((indentation
-               (when block-end
-                 (goto-char block-end)
-                 (gdscript--util-forward-comment)
-                 (current-indentation))))
-          (if (and indentation (not (zerop indentation)))
-              (set (make-local-variable 'gdscript-indent-offset) indentation)
-            (when gdscript-indent-guess-indent-offset-verbose
-              (message "Can't guess gdscript-indent-offset, using defaults: %s"
-                       gdscript-indent-offset))))))))
-
 (defun gdscript-indent-context ()
   "Get information about the current indentation context.
 Context is returned in a cons with the form (STATUS . START).
diff --git a/gdscript-mode.el b/gdscript-mode.el
index b5e76a6..610301f 100644
--- a/gdscript-mode.el
+++ b/gdscript-mode.el
@@ -181,10 +181,7 @@ the last command event was a string delimiter."
   (setq-local outline-level
               #'(lambda ()
                   "`outline-level' function for gdscript mode."
-                  (1+ (/ (current-indentation) gdscript-indent-offset))))
-
-  (when gdscript-indent-guess-indent-offset
-    (gdscript-indent-guess-indent-offset)))
+                  (1+ (/ (current-indentation) gdscript-indent-offset)))))
 
 (provide 'gdscript-mode)
 
diff --git a/gdscript-tests.el b/gdscript-tests.el
index d3fa6a4..cef5154 100644
--- a/gdscript-tests.el
+++ b/gdscript-tests.el
@@ -44,7 +44,7 @@ BODY is code to be executed within the temp buffer.  Point is
 always located at the beginning of buffer."
   (declare (indent 1) (debug t))
   `(with-temp-buffer
-     (let ((gdscript-indent-guess-indent-offset nil))
+     (let ()
        (gdscript-mode)
        (insert ,contents)
        (goto-char (point-min))