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-rw-r--r--src/alloc.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/alloc.c b/src/alloc.c
index f479226845a..ae892e49d7d 100644
--- a/src/alloc.c
+++ b/src/alloc.c
@@ -1760,7 +1760,7 @@ static char const string_overrun_cookie[GC_STRING_OVERRUN_COOKIE_SIZE] =
#ifdef GC_CHECK_STRING_BYTES
-#define SDATA_SIZE(NBYTES) FLEXSIZEOF (struct sdata, data, NBYTES)
+#define SDATA_SIZE(NBYTES) FLEXSIZEOF (struct sdata, data, (NBYTES) + 1)
#else /* not GC_CHECK_STRING_BYTES */