diff --git a/build-constraints.yaml b/build-constraints.yaml
index 8fa5750b..9d92099c 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -5848,7 +5848,6 @@ packages:
         - find-clumpiness < 0 # tried find-clumpiness-0.2.3.2, but its *library* requires the disabled package: BiobaseNewick
         - find-clumpiness < 0 # tried find-clumpiness-0.2.3.2, but its *library* requires the disabled package: hierarchical-clustering
         - flexible-defaults < 0 # tried flexible-defaults-0.0.3, but its *library* requires the disabled package: th-extras
-        - fourmolu < 0 # tried fourmolu-0.3.0.0, but its *library* does not support: ghc-lib-parser-9.0.1.20210324
         - freer-simple < 0 # tried freer-simple-1.2.1.1, but its *library* does not support: template-haskell-2.17.0.0
         - friday < 0 # tried friday-0.2.3.1, but its *library* does not support: containers-0.6.4.1
         - friday < 0 # tried friday-0.2.3.1, but its *library* requires the disabled package: ratio-int