diff --git a/collects/htdp/image.ss b/collects/htdp/image.ss
index fc11909a07..7dd726815c 100644
--- a/collects/htdp/image.ss
+++ b/collects/htdp/image.ss
@@ -18,6 +18,7 @@ plt/collects/tests/mzscheme/htdp-image.ss
 
 (provide-primitives
          image?
+         image=?
          image-width
          image-height
          overlay