diff --git a/parser/internal/antlr_parser.h b/parser/internal/antlr_parser.h
index 9e0153c6a..b52b3b14f 100644
--- a/parser/internal/antlr_parser.h
+++ b/parser/internal/antlr_parser.h
@@ -46,7 +46,9 @@ class AntlrParserImpl final : public cel::Parser {
                            absl::flat_hash_set<std::string> library_ids)
       : options_(options),
         macro_registry_(std::move(macro_registry)),
-        library_ids_(std::move(library_ids)) {}
+        library_ids_(std::move(library_ids)) {
+    options_.enable_pratt_parser = false;
+  }
 
   ~AntlrParserImpl() override = default;
 
@@ -74,7 +76,9 @@ absl::StatusOr<std::unique_ptr<cel::Ast>> AntlrParseImpl(
 class AntlrParserBuilderImpl final : public cel::ParserBuilder {
  public:
   explicit AntlrParserBuilderImpl(const cel::ParserOptions& options)
-      : options_(options) {}
+      : options_(options) {
+    options_.enable_pratt_parser = false;
+  }
 
   cel::ParserOptions& GetOptions() override { return options_; }
 
diff --git a/parser/options.h b/parser/options.h
index eb9d2eeea..03dd95d2e 100644
--- a/parser/options.h
+++ b/parser/options.h
@@ -84,7 +84,7 @@ struct ParserOptions final {
   // This option is temporary and should not be used by new code outside of the
   // early testing of the Pratt parser.
   // TODO(b/527638023): Remove this option once the ANTLR parser is removed.
-  bool enable_pratt_parser = false;
+  bool enable_pratt_parser = true;
 };
 
 }  // namespace cel