diff --git a/pollen/private/reader-base.rkt b/pollen/private/reader-base.rkt
index 0756339..f7cec3f 100644
--- a/pollen/private/reader-base.rkt
+++ b/pollen/private/reader-base.rkt
@@ -95,7 +95,17 @@
           (match (dynamic-require 'pollen/private/drracket-buttons 'make-drracket-buttons (λ () #false))
             [(? procedure? make-buttons) (make-buttons my-command-char)])])]
       [(drracket:indentation)
-       (dynamic-require 'scribble/private/indentation 'determine-spaces)]
+       (λ (text pos)
+         (define line-idx (send text position-line pos))
+         (define line-start-pos (send text line-start-position line-idx))
+         (define line-end-pos (send text line-end-position line-idx))
+         (define first-vis-pos
+           (or
+            (for/first ([pos (in-range line-start-pos line-end-pos)]
+                        #:unless (char-blank? (send text get-character pos)))
+                       pos)
+            line-start-pos))
+         (- first-vis-pos line-start-pos))]
       [(drracket:default-filters)
        ;; derive this from `module-suffixes` entry in main info.rkt file
        (define module-suffixes ((get-info/full info-dir) 'module-suffixes))
diff --git a/pollen/private/ts.rktd b/pollen/private/ts.rktd
index 0c36a8b..ac12ce0 100644
--- a/pollen/private/ts.rktd
+++ b/pollen/private/ts.rktd
@@ -1 +1 @@
-1551468549
+1552249575