diff --git a/collects/framework/private/color.ss b/collects/framework/private/color.ss
index 647e7eb1..8acd112a 100644
--- a/collects/framework/private/color.ss
+++ b/collects/framework/private/color.ss
@@ -244,7 +244,7 @@
                    (set! invalid-tokens invalid-tree)
                    (set! invalid-tokens-start
                          (+ invalid-tokens-start tok-end change-length))))
-                ((>= edit-start-pos current-pos)
+                ((> edit-start-pos current-pos)
                  (set! invalid-tokens-start (+ change-length invalid-tokens-start)))
                 (else
                  (let-values (((tok-start tok-end valid-tree invalid-tree)