diff --git a/include/cxxopts.hpp b/include/cxxopts.hpp
index 76dcc1a..b24902a 100644
--- a/include/cxxopts.hpp
+++ b/include/cxxopts.hpp
@@ -138,11 +138,16 @@ toLocalString(std::string s)
 CXXOPTS_DIAGNOSTIC_PUSH
 CXXOPTS_IGNORE_WARNING("-Wnon-virtual-dtor")
 // This will be ignored under other compilers like LLVM clang.
-class UnicodeStringIterator : public
-  std::iterator<std::forward_iterator_tag, int32_t>
+class UnicodeStringIterator
 {
   public:
 
+  using iterator_category = std::forward_iterator_tag;
+  using value_type = int32_t;
+  using difference_type = std::ptrdiff_t;
+  using pointer = value_type*;
+  using reference = value_type&;
+
   UnicodeStringIterator(const icu::UnicodeString* string, int32_t pos)
   : s(string)
   , i(pos)
diff --git a/src/example.cpp b/src/example.cpp
index c6da3a0..d7a2426 100644
--- a/src/example.cpp
+++ b/src/example.cpp
@@ -62,7 +62,7 @@ parse(int argc, const char* argv[])
       ("tab-expansion", "Tab\texpansion")
       ("int", "An integer", cxxopts::value<int>(), "N")
       ("float", "A floating point number", cxxopts::value<float>())
-      ("vector", "A list of doubles", cxxopts::value<std::vector<double>>())
+      ("vector", "A list of doubles", cxxopts::value<std::vector<double>>()->default_value(""))
       ("option_that_is_too_long_for_the_help", "A very long option")
       ("l,list", "List all parsed arguments (including default values)")
       ("range", "Use range-for to list arguments")