diff --git a/services/brig/default.nix b/services/brig/default.nix
index 2ccdf50e79d..791266352cc 100644
--- a/services/brig/default.nix
+++ b/services/brig/default.nix
@@ -122,6 +122,7 @@
 , statistics
 , stomp-queue
 , streaming-commons
+, string-conversions
 , tasty
 , tasty-ant-xml
 , tasty-cannon
@@ -358,6 +359,7 @@ mkDerivation {
     servant-client-core
     spar
     streaming-commons
+    string-conversions
     tasty
     tasty-ant-xml
     tasty-cannon