diff --git a/build-constraints.yaml b/build-constraints.yaml
index d996b186..3452cfd2 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -2219,8 +2219,7 @@ packages:
         - vinyl
 
     "Christoph Breitkopf <chbreitkopf@gmail.com> @bokesan":
-        []
-        # - IntervalMap # build failure with GHC 8.4 https://github.com/bokesan/IntervalMap/issues/5
+        - IntervalMap
 
     "Michele Lacchia <michelelacchia@gmail.com> @rubik":
         - docopt
@@ -3271,7 +3270,6 @@ packages:
     # from inclusion due to compilation failure with ghc 8.4
     "Build failure with GHC 8.4":
         - Chart < 0 # build failure with GHC 8.4 https://github.com/timbod7/haskell-chart/issues/181
-        - IntervalMap < 0 # build failure with GHC 8.4 https://github.com/bokesan/IntervalMap/issues/5
         - OneTuple < 0 # build failure with GHC 8.4 https://github.com/fpco/stackage/pull/3359
         - PSQueue < 0 # build failure with GHC 8.4 (nowhere to report, it's ancient just let it die)
         - Rasterific < 0 # build failure with GHC 8.4 https://github.com/Twinside/Rasterific/issues/38