diff --git a/tools/cpp/CMakeLists.txt b/tools/cpp/CMakeLists.txt
index 85614b470..3875a7902 100644
--- a/tools/cpp/CMakeLists.txt
+++ b/tools/cpp/CMakeLists.txt
@@ -70,6 +70,10 @@ set (TEST_SOURCES
 
 set (TEST_LIBS ${GTEST_LIB})
 
+if (NOT WIN32)
+  list (APPEND TEST_LIBS pthread)
+endif ()
+
 # Build the testing binary.
 include_directories ("test")
 add_executable (generate_geocoding_data_test ${TEST_SOURCES})