diff --git a/depends/protobuf/CMakeLists.txt b/depends/protobuf/CMakeLists.txt
index 5b54c8335..9846fd4e5 100644
--- a/depends/protobuf/CMakeLists.txt
+++ b/depends/protobuf/CMakeLists.txt
@@ -68,7 +68,7 @@ IF (HAVE_HASH_MAP EQUAL 0)
 ENDIF()
 
 IF(UNIX)
-    FIND_PACKAGE(Threads)
+	FIND_PACKAGE(Threads REQUIRED)
 ENDIF()
 
 CONFIGURE_FILE("${CMAKE_CURRENT_SOURCE_DIR}/config.h.in" "${CMAKE_CURRENT_BINARY_DIR}/config.h")
@@ -247,4 +247,4 @@ IF(NOT CMAKE_CROSSCOMPILING)
     TARGET_LINK_LIBRARIES(protoc-bin protoc)
 
     EXPORT(TARGETS protoc-bin FILE ${CMAKE_BINARY_DIR}/ImportExecutables.cmake )
-ENDIF()
\ No newline at end of file
+ENDIF()