diff --git a/build-constraints.yaml b/build-constraints.yaml
index 8c641de3..053a6ec9 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -1043,7 +1043,7 @@ packages:
         - ghc-events
         - monad-extras
         - optparse-simple
-        # - hpack # build failure with GHC 8.4 https://github.com/sol/hpack/issues/276
+        - hpack
         - bindings-uname
         - stack < 9.9.9
 
@@ -3281,7 +3281,6 @@ packages:
         - heap < 0 # build failure with GHC 8.4 https://github.com/pruvisto/heap/issues/5
         - heterocephalus < 0 # build failure with GHC 8.4 https://github.com/arowM/heterocephalus/issues/22
         - hoogle < 0 # build failure with GHC 8.4 https://github.com/ndmitchell/hoogle/issues/245
-        - hpack < 0 # build failure with GHC 8.4 https://github.com/sol/hpack/issues/276
         - hpqtypes < 0 # build failure with GHC 8.4 https://github.com/scrive/hpqtypes/issues/7
         - hw-fingertree-strict < 0 # build failure with GHC 8.4 https://hub.darcs.net/ross/fingertree/issue/5
         - inline-c < 0 # build failure with GHC 8.4 https://github.com/fpco/inline-c/issues/73