diff --git a/build-constraints.yaml b/build-constraints.yaml
index 2e398fcb..c786fccd 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -2307,7 +2307,7 @@ packages:
     "Yorick Laupa yo.eight@gmail.com @YoEight":
         - eventstore < 0 # GHC 8.4 via text-format
         - dotnet-timespan
-        - eventsource-api
+        - eventsource-api < 0 # https://github.com/YoEight/eventsource-api/issues/4
         - eventsource-geteventstore-store < 0 # GHC 8.4 via protolude
         - eventsource-store-specs < 0 # tasty-hspec
         - eventsource-stub-store < 0 # GHC 8.4 via protolude