diff --git a/build-constraints.yaml b/build-constraints.yaml
index 464b19be..87e219d2 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -690,7 +690,7 @@ packages:
         - ClustalParser
         - EntrezHTTP
         - Genbank
-        # - RNAlien  # https://github.com/eggzilla/RNAlien/issues/8 (build failure)
+        - RNAlien
         - Taxonomy
         # - TaxonomyTools # build failure
         - ViennaRNAParser
@@ -2768,6 +2768,9 @@ packages:
         # https://github.com/fpco/stackage/issues/2207
         - xlsx < 0.4
 
+        # https://github.com/eggzilla/RNAlien/issues/8
+        - ClustalParser < 1.2
+
 # end of packages
 
 # Package flags are applied to individual packages, and override the values of