diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3a88207..76bba8a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,12 @@
 This is the changelog for `cxxopts`, a C++11 library for parsing command line
 options. The project adheres to semantic versioning.
 
+## 2.2
+
+### Changed
+
+* Allow integers to have leading zeroes.
+
 ## 2.1.1
 
 ### Bug Fixes
diff --git a/include/cxxopts.hpp b/include/cxxopts.hpp
index 59a7178..206e1c7 100644
--- a/include/cxxopts.hpp
+++ b/include/cxxopts.hpp
@@ -447,7 +447,7 @@ namespace cxxopts
     namespace
     {
       std::basic_regex<char> integer_pattern
-        ("(-)?(0x)?([1-9a-zA-Z][0-9a-zA-Z]*)|((0x)?0)");
+        ("(-)?(0x)?([0-9a-zA-Z]+)|((0x)?0)");
       std::basic_regex<char> truthy_pattern
         ("(t|T)(rue)?");
       std::basic_regex<char> falsy_pattern
diff --git a/test/options.cpp b/test/options.cpp
index bfaa635..044d42b 100644
--- a/test/options.cpp
+++ b/test/options.cpp
@@ -304,6 +304,30 @@ TEST_CASE("Integers", "[options]")
   CHECK(positional[6] == 0x0);
 }
 
+TEST_CASE("Leading zero integers", "[options]")
+{
+  cxxopts::Options options("parses_integers", "parses integers correctly");
+  options.add_options()
+    ("positional", "Integers", cxxopts::value<std::vector<int>>());
+
+  Argv av({"ints", "--", "05", "06", "0x0ab", "0x0001"});
+
+  char** argv = av.argv();
+  auto argc = av.argc();
+
+  options.parse_positional("positional");
+  auto result = options.parse(argc, argv);
+
+  REQUIRE(result.count("positional") == 4);
+
+  auto& positional = result["positional"].as<std::vector<int>>();
+  REQUIRE(positional.size() == 4);
+  CHECK(positional[0] == 5);
+  CHECK(positional[1] == 6);
+  CHECK(positional[2] == 0xab);
+  CHECK(positional[3] == 0x1);
+}
+
 TEST_CASE("Unsigned integers", "[options]")
 {
   cxxopts::Options options("parses_unsigned", "detects unsigned errors");
@@ -502,4 +526,4 @@ TEST_CASE("Unrecognised options", "[options]") {
     REQUIRE(argc == 3);
     CHECK_THAT(argv[1], Catch::Equals("--unknown"));
   }
-}
\ No newline at end of file
+}