1 files changed, 1 insertions, 0 deletions
diff --git a/src/wasm.h b/src/wasm.h
index 96c9271fe..dbedc05f4 100644
--- a/src/wasm.h
+++ b/src/wasm.h
@@ -1566,6 +1566,7 @@ public:
 
 class BrOn : public SpecificExpression<Expression::BrOnId> {
 public:
+  BrOn() = default;
   BrOn(MixedArena& allocator) {}
 
   BrOnOp op;