diff --git a/CMakeLists.txt b/CMakeLists.txt
index 8066e188..2515c559 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required (VERSION 2.6)
+cmake_minimum_required (VERSION 2.6.4)
 include (CheckFunctionExists)
 include (CheckIncludeFile)
 include (CheckCXXSourceCompiles)