diff --git a/file_list.c b/file_list.c
index 7d973a2d2a..7d02c549a6 100644
--- a/file_list.c
+++ b/file_list.c
@@ -14,7 +14,6 @@
  *  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#define _GNU_SOURCE
 #include <stdlib.h>
 #include <string.h>
 #include "file_list.h"
diff --git a/rewind.c b/rewind.c
index 71b8163ada..ac85956e5d 100644
--- a/rewind.c
+++ b/rewind.c
@@ -48,9 +48,9 @@
 //if unaligned memory access is illegal, define NO_UNALIGNED_MEM
 
 #if SIZE_MAX == 0xFFFFFFFF
-extern char test[(sizeof(size_t)==4)?1:-1];
+extern char double_check_sizeof_size_t[(sizeof(size_t)==4)?1:-1];
 #elif SIZE_MAX == 0xFFFFFFFFFFFFFFFF
-extern char test[(sizeof(size_t)==8)?1:-1];
+extern char double_check_sizeof_size_t[(sizeof(size_t)==8)?1:-1];
 #define USE_64BIT
 #else
 #error your compiler is insane.