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-rw-r--r--internal/class.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/internal/class.h b/internal/class.h
index 8942f80c9b..d4c1c72414 100644
--- a/internal/class.h
+++ b/internal/class.h
@@ -86,7 +86,7 @@ typedef struct rb_subclass_entry rb_subclass_entry_t;
typedef struct rb_classext_struct rb_classext_t;
#if USE_RVARGC
-# define RCLASS_EXT(c) ((rb_classext_t *)((char *)c + sizeof(struct RClass)))
+# define RCLASS_EXT(c) ((rb_classext_t *)((char *)(c) + sizeof(struct RClass)))
#else
# define RCLASS_EXT(c) (RCLASS(c)->ptr)
#endif