diff --git a/runtime/Cpp/runtime/src/support/BitSet.h b/runtime/Cpp/runtime/src/support/BitSet.h
index ccbb6ff1c..bf849b187 100644
--- a/runtime/Cpp/runtime/src/support/BitSet.h
+++ b/runtime/Cpp/runtime/src/support/BitSet.h
@@ -9,7 +9,7 @@
 
 namespace antlrcpp {
 
-  class ANTLR4CPP_PUBLIC BitSet : public std::bitset<1024> {
+  class ANTLR4CPP_PUBLIC BitSet : public std::bitset<2048> {
   public:
     size_t nextSetBit(size_t pos) const {
       for (size_t i = pos; i < size(); i++){