diff --git a/zilti/packages/chicken.scm b/zilti/packages/chicken.scm
index 2eb206f..1c99955 100644
--- a/zilti/packages/chicken.scm
+++ b/zilti/packages/chicken.scm
@@ -9153,7 +9153,7 @@
     (source
       (origin
         (method url-fetch)
-        (uri (egg-uri "fmt" version))
+        (uri (egg-uri "fmt" "0.8.11.2"))
         (sha256
           (base32 "0w04zfkhh8cnns6n0m1s9zh8jn7nvm3h4nzvfzxiih84i6y13yx1"))))
     (propagated-inputs