diff --git a/build-constraints.yaml b/build-constraints.yaml
index 203d1d45..3a823025 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -3261,6 +3261,9 @@ packages:
         # https://github.com/fpco/stackage/issues/2587
         - extra < 1.6
 
+        # https://github.com/michalkonecny/mixed-types-num/issues/1
+        - mixed-types-num < 0.2
+
 # end of packages
 
 # Package flags are applied to individual packages, and override the values of