diff --git a/CMakeLists.txt b/CMakeLists.txt
index c39a492e6..e3ee74d55 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -2,8 +2,12 @@ cmake_minimum_required( VERSION 2.4 )
 project(ZDoom)
 
 if( COMMAND cmake_policy )
-	cmake_policy( SET CMP0011 NEW )
-	cmake_policy( SET CMP0054 NEW )
+	if( POLICY CMP0011 )
+		cmake_policy( SET CMP0011 NEW )
+	endif( POLICY CMP0011 )
+	if( POLICY CMP0054 )
+		cmake_policy( SET CMP0054 NEW )
+	endif( POLICY CMP0054 )
 endif( COMMAND cmake_policy )
 
 list( APPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR} )
diff --git a/CreateLaunchers.cmake b/CreateLaunchers.cmake
index 83cc08b44..bd2b3e473 100644
--- a/CreateLaunchers.cmake
+++ b/CreateLaunchers.cmake
@@ -44,7 +44,9 @@ if(__create_launchers)
 endif()
 set(__create_launchers YES)
 
-cmake_policy( SET CMP0026 OLD )
+if( POLICY CMP0026 )
+	cmake_policy( SET CMP0026 OLD )
+endif( POLICY CMP0026 )
 
 include(CleanDirectoryList)