1 files changed, 1 insertions, 0 deletions
diff --git a/internal.h b/internal.h
index 48a3a763d5..d17d2ba826 100644
--- a/internal.h
+++ b/internal.h
@@ -187,6 +187,7 @@ size_t rb_strftime(char *s, size_t maxsize, const char *format, rb_encoding *enc
 
 /* string.c */
 int rb_str_buf_cat_escaped_char(VALUE result, unsigned int c, int unicode_p);
+int rb_str_symname_p(VALUE);
 
 /* struct.c */
 VALUE rb_struct_init_copy(VALUE copy, VALUE s);