diff --git a/CMakeLists.txt b/CMakeLists.txt
index 267a57d55..73c866bbb 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,7 +1,9 @@
 cmake_minimum_required(VERSION 2.8.9)
 
-# In Qt 5.1+ we have our own main() function, don't autolink to qtmain on Windows
-cmake_policy(SET CMP0020 OLD)
+IF(WIN32)
+	# In Qt 5.1+ we have our own main() function, don't autolink to qtmain on Windows
+	cmake_policy(SET CMP0020 OLD)
+ENDIF()
 
 project(MultiMC)
 
diff --git a/depends/pack200/CMakeLists.txt b/depends/pack200/CMakeLists.txt
index d71f65351..386c8bb8f 100644
--- a/depends/pack200/CMakeLists.txt
+++ b/depends/pack200/CMakeLists.txt
@@ -1,7 +1,9 @@
 CMAKE_MINIMUM_REQUIRED(VERSION 2.6)
 
-# In Qt 5.1+ we have our own main() function, don't autolink to qtmain on Windows
-cmake_policy(SET CMP0020 OLD)
+IF(WIN32)
+	# In Qt 5.1+ we have our own main() function, don't autolink to qtmain on Windows
+	cmake_policy(SET CMP0020 OLD)
+ENDIF()
 
 project(unpack200)