diff --git a/src/dune b/src/dune
index 78060e9f..17d9707a 100644
--- a/src/dune
+++ b/src/dune
@@ -3,5 +3,5 @@
   (_
     (flags :standard -warn-error
            -a+8+9 -w +a-4-32-40-41-42-44-48
-           -color always -safe-string -short-paths)
+           -color always -strict-sequence -safe-string -short-paths)
     (ocamlopt_flags :standard -O3 -color always -unbox-closures -unbox-closures-factor 20)))