diff --git a/core/src/CMakeLists.txt b/core/src/CMakeLists.txt
index 8d88684..526283c 100644
--- a/core/src/CMakeLists.txt
+++ b/core/src/CMakeLists.txt
@@ -9,6 +9,9 @@ include(FetchContent)
 
 find_package(OpenSSL REQUIRED)
 
+set(THREADS_PREPER_PTHREAD_FLAG ON)
+find_package(Threads REQUIRED)
+
 add_library(pigeon-core ${CORE_SRC})
 target_include_directories(pigeon-core PUBLIC ${CMAKE_CURRENT_LIST_DIR}/src)
-target_link_libraries(pigeon-core OpenSSL::SSL)
+target_link_libraries(pigeon-core OpenSSL::SSL Threads::Threads)