1 files changed, 2 insertions, 1 deletions

diff --git a/marshal.c b/marshal.c
index c1b19a6e63..e19bd5f708 100644
--- a/marshal.c
+++ b/marshal.c
@@ -40,6 +40,7 @@
 #include "ruby/util.h"
 #include "builtin.h"
 #include "shape.h"
+#include "ruby/internal/attr/nonstring.h"

 #define BITSPERSHORT (2*CHAR_BIT)
 #define SHORTMASK ((1<<BITSPERSHORT)-1)
@@ -1515,7 +1516,7 @@ name_equal(const char *name, size_t nlen, const char *p, long l)
 static int
 sym2encidx(VALUE sym, VALUE val)
 {
- static const char name_encoding[8] = "encoding";
+ RBIMPL_ATTR_NONSTRING() static const char name_encoding[8] = "encoding";
 const char *p;
 long l;
 if (rb_enc_get_index(sym) != ENCINDEX_US_ASCII) return -1;