diff --git a/CMakeLists.txt b/CMakeLists.txt
index e9ea03922..0f40e00cc 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,6 +1,15 @@
 cmake_minimum_required(VERSION 2.6)
 project(OSRM)
 include(FindPackageHandleStandardArgs)
+
+TRY_RUN(SHARED_LIBRARY_PATH_TYPE SHARED_LIBRARY_PATH_INFO_COMPILED ${PROJECT_BINARY_DIR}/CMakeTmp ${PROJECT_SOURCE_DIR}/cmake/size.cpp OUTPUT_VARIABLE IS_64_SYSTEM)
+if(IS_64_SYSTEM)
+	message(STATUS "System supports 64 bits.")
+else(IS_64_SYSTEM)
+	MESSAGE(WARNING "Compiling on a 32 bit system is unsupported!")
+endif(IS_64_SYSTEM)
+
+
 set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} ${CMAKE_CURRENT_SOURCE_DIR}/cmake)
 set(BOOST_COMPONENTS filesystem regex system thread)
 
diff --git a/cmake/size.cpp b/cmake/size.cpp
new file mode 100644
index 000000000..2ac045227
--- /dev/null
+++ b/cmake/size.cpp
@@ -0,0 +1,9 @@
+#include <cstdlib>
+
+int main( int argc, char* argv[] ) {
+	size_t size = sizeof(void*);
+	if ( 4 == size ) {
+		return 0;
+	}
+	return 1;
+}
\ No newline at end of file