diff --git a/build-constraints.yaml b/build-constraints.yaml
index f6673730..0679db99 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -1599,7 +1599,7 @@ packages:
 
     "Marios Titas <redneb@gmx.com> @redneb":
         - HsOpenSSL-x509-system
-        # - adler32 # build failure with GHC 8.4: https://github.com/redneb/hs-adler32/issues/1
+        - adler32
         - btrfs
         - disk-free-space
         - hxt-css