diff --git a/gnu/packages/astronomy.scm b/gnu/packages/astronomy.scm
index a4a315e92a..52951bcbef 100644
--- a/gnu/packages/astronomy.scm
+++ b/gnu/packages/astronomy.scm
@@ -1649,6 +1649,17 @@ (define-public python-asdf
 implementation of the ASDF Standard.")
     (license license:bsd-3)))
 
+(define-public python-asdf-3
+  (package
+    (inherit python-asdf)
+    (version "3.5.0")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (pypi-uri "asdf" version))
+       (sha256
+        (base32 "0scnw5y4x5k3vyfylq0w612b662xlccx3gsscaw082zlv2yxfyh4"))))))
+
 (define-public python-asdf-astropy
   (package
     (name "python-asdf-astropy")