diff --git a/collects/macro-debugger/syntax-browser/text.rkt b/collects/macro-debugger/syntax-browser/text.rkt
index 839123c..d96a4a2 100644
--- a/collects/macro-debugger/syntax-browser/text.rkt
+++ b/collects/macro-debugger/syntax-browser/text.rkt
@@ -4,7 +4,7 @@
          racket/gui
          drracket/arrow
          framework/framework
-         unstable/interval-map
+         data/interval-map
          unstable/gui/notify
          "interfaces.rkt")