diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1cbeb8f..e1e40d6 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -231,14 +231,7 @@ if(NOT Linguist_FOUND)
   message(WARNING " Qt4 Linguist not found, please install it if you want Avogadro translations")
 endif()
 
-find_package(Eigen3) # find and setup Eigen3 if available
-if(NOT EIGEN3_FOUND)
-   message(STATUS "Cannot find Eigen3, trying Eigen2")
-   find_package(Eigen2 REQUIRED) # Some version is required
-else()
-# Use Stage10 Eigen3 support
-   set (EIGEN2_SUPPORT_STAGE10_FULL_EIGEN2_API TRUE)
-endif()
+find_package(Eigen2 REQUIRED)
 
 find_package(ZLIB REQUIRED)
 find_package(OpenBabel2 REQUIRED) # find and setup OpenBabel