--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -260,12 +260,12 @@
     set(BOOST_ROOT ${SOURCE_BASE_DIR}/boost${Boost_root_suffix}) 
    endif(NOT BOOST_ROOT AND NOT $ENV{BOOST_ROOT} STREQUAL "") 
 ENDIF(WIN32)
-FIND_PACKAGE(Boost 1.41 COMPONENTS thread date_time regex filesystem iostreams system signals)
+FIND_PACKAGE(Boost 1.40 COMPONENTS thread date_time regex filesystem iostreams system signals)
 IF (NOT Boost_FOUND)
   IF(WIN32)
     MESSAGE(FATAL_ERROR "Boost not found. Bad BOOST_ROOT? On windows, try editing Boost_root_suffix")
   ELSE()
-    MESSAGE(FATAL_ERROR "Boost not found. Maybe wrong version. Hugin requires at least version 1.41")
+    MESSAGE(FATAL_ERROR "Boost not found. Maybe wrong version. Hugin requires at least version 1.40")
   ENDIF()
 ENDIF (NOT Boost_FOUND)