diff --git a/xcode/valijson.xcodeproj/project.pbxproj b/xcode/valijson.xcodeproj/project.pbxproj
index f8ecc4f..d11bc01 100644
--- a/xcode/valijson.xcodeproj/project.pbxproj
+++ b/xcode/valijson.xcodeproj/project.pbxproj
@@ -1044,11 +1044,13 @@
 					"$(inherited)",
 					GTEST_USE_OWN_TR1_TUPLE,
 					GTEST_HAS_PARAM_TEST,
+					PICOJSON_USE_INT64,
 				);
 				HEADER_SEARCH_PATHS = (
 					"../thirdparty/gtest-1.7.0/include",
 					"../thirdparty/gtest-1.7.0",
 					"../thirdparty/jsoncpp-0.9.4/include",
+					"../thirdparty/picojson-1.3.0",
 					"../thirdparty/rapidjson-0.1/include",
 					../include,
 					/usr/local/include,
@@ -1065,11 +1067,13 @@
 				GCC_PREPROCESSOR_DEFINITIONS = (
 					GTEST_USE_OWN_TR1_TUPLE,
 					GTEST_HAS_PARAM_TEST,
+					PICOJSON_USE_INT64,
 				);
 				HEADER_SEARCH_PATHS = (
 					"../thirdparty/gtest-1.7.0/include",
 					"../thirdparty/gtest-1.7.0",
 					"../thirdparty/jsoncpp-0.9.4/include",
+					"../thirdparty/picojson-1.3.0",
 					"../thirdparty/rapidjson-0.1/include",
 					../include,
 					/usr/local/include,