diff --git a/libnatspec/CMakeLists.txt b/libnatspec/CMakeLists.txt
index e813d0221..b5bd7903e 100644
--- a/libnatspec/CMakeLists.txt
+++ b/libnatspec/CMakeLists.txt
@@ -4,6 +4,8 @@ cmake_policy(SET CMP0020 NEW)
 # this policy was introduced in cmake 3.0
 # remove if, once 3.0 will be used on unix
 if (${CMAKE_MAJOR_VERSION} GREATER 2)
+	# old policy do not use MACOSX_RPATH
+	cmake_policy(SET CMP0042 OLD)
 	cmake_policy(SET CMP0043 OLD)
 endif()
 set(CMAKE_AUTOMOC OFF)