diff --git a/CMakeLists.txt b/CMakeLists.txt
index d5b11cb..115e0df 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -15,7 +15,7 @@ else()
 endif()
 
 #Only tested with versions 1.55 and 1.56
-find_package(Boost 1.41.0 COMPONENTS system REQUIRED)
+find_package(Boost 1.41.0 COMPONENTS system thread REQUIRED)
 message("Boost include dir: ${Boost_INCLUDE_DIR}")
 message("Boost libraries: ${Boost_LIBRARIES}")
 include_directories(${Boost_INCLUDE_DIR})
diff --git a/http_examples.cpp b/http_examples.cpp
index e0fa0a2..b7cedbb 100644
--- a/http_examples.cpp
+++ b/http_examples.cpp
@@ -2,6 +2,7 @@
 #include "client_http.hpp"
 
 //Added for the json-example
+#define BOOST_SPIRIT_THREADSAFE
 #include <boost/property_tree/ptree.hpp>
 #include <boost/property_tree/json_parser.hpp>
 
diff --git a/https_examples.cpp b/https_examples.cpp
index b875004..1011129 100644
--- a/https_examples.cpp
+++ b/https_examples.cpp
@@ -2,6 +2,7 @@
 #include "client_https.hpp"
 
 //Added for the json-example
+#define BOOST_SPIRIT_THREADSAFE
 #include <boost/property_tree/ptree.hpp>
 #include <boost/property_tree/json_parser.hpp>