diff --git a/CMakeLists.txt b/CMakeLists.txt
index 2d12c33..c8946b5 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -44,6 +44,7 @@ else()
 endif()
 
 add_definitions(-std=c99 -Wall -ggdb3)
+add_definitions(-D_FILE_OFFSET_BITS=64)
 
 foreach(_I doscalls;msg;nls;quecalls;viocalls;kbdcalls;sesmgr)
     add_library(${_I} SHARED "native/${_I}.c")