diff --git a/cmake/Modules/FindPCAP.cmake b/cmake/Modules/FindPCAP.cmake
index 910f69fb6..100ebbf48 100644
--- a/cmake/Modules/FindPCAP.cmake
+++ b/cmake/Modules/FindPCAP.cmake
@@ -129,7 +129,7 @@ check_function_exists("pcap_list_datalinks" HAVE_PCAP_LIST_DATALINKS)
 check_function_exists("pcap_open_dead" HAVE_PCAP_OPEN_DEAD)
 check_function_exists("pcap_set_datalink" HAVE_PCAP_SET_DATALINK)
 set(CMAKE_REQUIRED_INCLUDES ${OLD_CMAKE_REQUIRED_INCLUDES})
-set(CMAKE_REQUIRED_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES})
+set(CMAKE_REQUIRED_LIBRARIES ${OLD_CMAKE_REQUIRED_LIBRARIES})
 
 include(FindPackageHandleStandardArgs)
 find_package_handle_standard_args(PCAP DEFAULT_MSG PCAP_INCLUDE_DIRS PCAP_LIBRARIES)