diff --git a/gcc/asan.c b/gcc/asan.c
index 89ecd99b182..d7449ce7d0e 100644
--- a/gcc/asan.c
+++ b/gcc/asan.c
@@ -105,7 +105,7 @@ along with GCC; see the file COPYING3.  If not see
      int
      foo ()
      {
-       char a[23] = {0};
+       char a[24] = {0};
        int b[2] = {0};
 
        a[5] = 1;
@@ -1634,7 +1634,7 @@ asan_redzone_buffer::flush_if_full (void)
      int
      foo ()
      {
-       char a[23] = {0};
+       char a[24] = {0};
        int b[2] = {0};
 
        a[5] = 1;