diff --git a/src/Language/Wasm/Builder.hs b/src/Language/Wasm/Builder.hs
index d2d98b5..da7c8f8 100644
--- a/src/Language/Wasm/Builder.hs
+++ b/src/Language/Wasm/Builder.hs
@@ -22,7 +22,7 @@ module Language.Wasm.Builder (
     export,
     nextFuncIndex, setGlobalInitializer,
     GenFun,
-    Glob, Loc, Fn(..), Mem, Tbl,
+    Glob, Loc, Fn(..), Mem, Tbl, Label,
     param, local, label,
     ret,
     arg,