diff --git a/build/inc/autoconfig.h b/build/inc/autoconfig.h
index 49870e9..0829201 100644
--- a/build/inc/autoconfig.h
+++ b/build/inc/autoconfig.h
@@ -190,7 +190,7 @@
 #define _FILE_OFFSET_BITS 64
 
 /* Define to 1 to make fseeko visible on some hosts (e.g. glibc 2.2). */
-/* #undef _LARGEFILE_SOURCE */
+#define _LARGEFILE_SOURCE 1
 
 /* Large files support */
 #define _LARGE_FILE_SOURCE /**/
diff --git a/build/inc/upnpconfig.h b/build/inc/upnpconfig.h
index 80bdec6..e3fba7c 100644
--- a/build/inc/upnpconfig.h
+++ b/build/inc/upnpconfig.h
@@ -65,7 +65,7 @@
 #define _FILE_OFFSET_BITS 64
 
 /** Define to 1 to make fseeko visible on some hosts (e.g. glibc 2.2). */
-/* #undef _LARGEFILE_SOURCE */
+#define _LARGEFILE_SOURCE 1
 
 /** Large files support */
 #define _LARGE_FILE_SOURCE /**/