diff --git a/build-constraints.yaml b/build-constraints.yaml
index afabeebe..2e60d9dc 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -1162,6 +1162,11 @@ packages:
         # https://github.com/fpco/stackage/issues/659
         - pandoc < 1.15
 
+        # https://github.com/k-bx/protocol-buffers/issues/1
+        - protocol-buffers < 2.1
+        - protocol-buffers-descriptor < 2.1
+        - hprotoc < 2.1
+
 # Package flags are applied to individual packages, and override the values of
 # global-flags
 package-flags: