diff --git a/runtime/Cpp/runtime/src/ANTLRFileStream.cpp b/runtime/Cpp/runtime/src/ANTLRFileStream.cpp
index 62061bb83..005149044 100755
--- a/runtime/Cpp/runtime/src/ANTLRFileStream.cpp
+++ b/runtime/Cpp/runtime/src/ANTLRFileStream.cpp
@@ -9,6 +9,9 @@
 
 using namespace antlr4;
 
+ANTLRFileStream::ANTLRFileStream(): ANTLRInputStream() {
+}
+
 void ANTLRFileStream::loadFromFile(const std::string &fileName) {
   _fileName = fileName;
   if (_fileName.empty()) {
diff --git a/runtime/Cpp/runtime/src/ANTLRFileStream.h b/runtime/Cpp/runtime/src/ANTLRFileStream.h
index 1beb36ca2..1a1a91bde 100755
--- a/runtime/Cpp/runtime/src/ANTLRFileStream.h
+++ b/runtime/Cpp/runtime/src/ANTLRFileStream.h
@@ -14,6 +14,7 @@ namespace antlr4 {
   // TODO: this class needs testing.
   class ANTLR4CPP_PUBLIC ANTLRFileStream : public ANTLRInputStream {
   public:
+    ANTLRFileStream();
     ANTLRFileStream(const std::string &) = delete;
     ANTLRFileStream(const char *data, size_t length) = delete;
     ANTLRFileStream(std::istream &stream) = delete;