diff --git a/pkgs/at-exp-lib/at-exp/lang/reader.rkt b/pkgs/at-exp-lib/at-exp/lang/reader.rkt
index 7fbd16ac4b..7fbb71698e 100644
--- a/pkgs/at-exp-lib/at-exp/lang/reader.rkt
+++ b/pkgs/at-exp-lib/at-exp/lang/reader.rkt
@@ -44,4 +44,6 @@
             (try-dynamic-require 'syntax-color/scribble-lexer 'scribble-lexer)]
            [(definitions-text-surrogate)
             'scribble/private/indentation]
+           [(drracket:indentation)
+            (dynamic-require 'scribble/private/indentation 'determine-spaces)]
            [else (fallback)]))))))
diff --git a/pkgs/at-exp-lib/scribble/base/reader.rkt b/pkgs/at-exp-lib/scribble/base/reader.rkt
index 646b3a6a10..2e3ad28608 100644
--- a/pkgs/at-exp-lib/scribble/base/reader.rkt
+++ b/pkgs/at-exp-lib/scribble/base/reader.rkt
@@ -26,8 +26,10 @@
     (case key
       [(color-lexer)
        (dynamic-require 'syntax-color/scribble-lexer 'scribble-inside-lexer)]
-       [(definitions-text-surrogate)
-        'scribble/private/indentation]
+      [(definitions-text-surrogate)
+       'scribble/private/indentation]
+      [(drracket:indentation)
+       (dynamic-require 'scribble/private/indentation 'determine-spaces)]
       [else (default key defval)])))
 
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