diff --git a/build-constraints.yaml b/build-constraints.yaml
index 79685bba..fa329ef0 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -1730,6 +1730,9 @@ packages:
         - tz
         - tzdata
 
+    "Timothy Klim <stackage@timothyklim.com> @TimothyKlim":
+        - pkcs10
+
     "Stackage upper bounds":
         # https://github.com/fpco/stackage/issues/537
         - zlib < 0.6