diff --git a/build-constraints.yaml b/build-constraints.yaml
index 878c6d72..414a75fa 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -741,6 +741,7 @@ packages:
         - sdl2
 
     "Leon Mergen leon@solatis.com @solatis":
+        - base58string
         - bitcoin-script
         - bitcoin-tx
         - hexstring