diff --git a/nmap_config.h.in b/nmap_config.h.in
index 8a77a6935..38617f27b 100644
--- a/nmap_config.h.in
+++ b/nmap_config.h.in
@@ -215,9 +215,6 @@ extern "C" int gethostname (char *, unsigned int);
 /* Number of bits in a file offset, on hosts where this is settable. */
 #undef _FILE_OFFSET_BITS
 
-/* Define to 1 to make fseeko visible on some hosts (e.g. glibc 2.2). */
-#undef _LARGEFILE_SOURCE
-
 /* Define for large files, on AIX-style hosts. */
 #undef _LARGE_FILES
 
diff --git a/nse_fs.cc b/nse_fs.cc
index 8af24a6ae..a83c9bfb2 100644
--- a/nse_fs.cc
+++ b/nse_fs.cc
@@ -26,13 +26,7 @@
  *
  **/
 
-#ifndef _WIN32
-#ifndef _AIX
-#define _FILE_OFFSET_BITS 64 /* Linux, Solaris and HP-UX */
-#else
-#define _LARGE_FILES 1 /* AIX */
-#endif
-#endif
+#include "nmap_config.h"
 
 #define _LARGEFILE64_SOURCE