diff --git a/build-constraints.yaml b/build-constraints.yaml
index 5feed0f1..39909999 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -714,7 +714,7 @@ packages:
     "Timothy Jones git@zmthy.io @zmthy":
         - cabal-test-quickcheck
         - http-media
-        
+
     "Greg V greg@unrelenting.technology @myfreeweb":
         - gitson
         - pcre-heavy
@@ -722,6 +722,9 @@ packages:
     "Francesco Mazzoli f@mazzo.li @bitonic":
         - language-c-quote
 
+    "Sönke Hahn soenkehahn@gmail.com @soenkehahn":
+        - string-conversions
+
     "Stackage upper bounds":
 
         # Force a specific version that's compatible with transformers 0.3