1 files changed, 3 insertions, 2 deletions
diff --git a/include/mbgl/style/expression/array_assertion.hpp b/include/mbgl/style/expression/array_assertion.hpp
index af153611ff..0c0912b73e 100644
--- a/include/mbgl/style/expression/array_assertion.hpp
+++ b/include/mbgl/style/expression/array_assertion.hpp
@@ -14,7 +14,7 @@ namespace expression {
 class ArrayAssertion : public Expression  {
 public:
     ArrayAssertion(type::Array type_, std::unique_ptr<Expression> input_) :
-        Expression(type_),
+        Expression(Kind::ArrayAssertion, type_),
         input(std::move(input_))
     {}
 
@@ -24,7 +24,8 @@ public:
     void eachChild(const std::function<void(const Expression&)>& visit) const override;
 
     bool operator==(const Expression& e) const override {
-        if (auto rhs = dynamic_cast<const ArrayAssertion*>(&e)) {
+        if (e.getKind() == Kind::ArrayAssertion) {
+            auto rhs = static_cast<const ArrayAssertion*>(&e);
             return getType() == rhs->getType() && *input == *(rhs->input);
         }
         return false;