diff --git a/CMakeLists.txt b/CMakeLists.txt
index 0d4adae..59ca279 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -9,6 +9,7 @@ ELSE()
 	FIND_PACKAGE (Threads REQUIRED)
 	SET(CMAKE_CXX_FLAGS_RELEASE "-O3")
 	SET(CMAKE_C_FLAGS_RELEASE "-O3")
+	ADD_DEFINITIONS(-D_LARGEFILE64_SOURCE=1 -D_FILE_OFFSET_BITS=64)
 ENDIF()
 
 ADD_LIBRARY (linecount SHARED src/turbo_linecount.cpp src/turbo_linecount.h)
diff --git a/src/turbo_linecount.h b/src/turbo_linecount.h
index 0919344..1c01f65 100644
--- a/src/turbo_linecount.h
+++ b/src/turbo_linecount.h
@@ -12,12 +12,6 @@
 #define LINECOUNT_VERSION_MAJOR 1
 #define LINECOUNT_VERSION_MINOR 0
 
-#if defined(__CYGWIN__) || defined(__linux__) || defined(__MINGW32__)
-#ifndef _LARGEFILE64_SOURCE
-#define _LARGEFILE64_SOURCE 1
-#endif
-#endif
-
 #ifdef __cplusplus
 
 ///////////////////////////////////////////// Headers