diff --git a/collects/2htdp/tests/test-image.ss b/collects/2htdp/tests/test-image.ss
index 3554b60c5c..a2131f7c7c 100644
--- a/collects/2htdp/tests/test-image.ss
+++ b/collects/2htdp/tests/test-image.ss
@@ -1,6 +1,7 @@
 #lang scheme/base
 (require "../../mrlib/image-core.ss"
          "../private/image-more.ss"
+         "../private/img-err.ss"
          "../../mrlib/private/image-core-bitmap.ss"
          lang/posn
          scheme/math