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-rw-r--r--internal.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/internal.h b/internal.h
index 369b32f90f..7088deb706 100644
--- a/internal.h
+++ b/internal.h
@@ -1250,7 +1250,7 @@ struct RBasicRaw {
VALUE klass;
};
-#define RBASIC_CLEAR_CLASS(obj) memset(&(((struct RBasicRaw *)((VALUE)(obj)))->klass), 0, sizeof(((struct RBasicRaw *)
+#define RBASIC_CLEAR_CLASS(obj) memset(&(((struct RBasicRaw *)((VALUE)(obj)))->klass), 0, sizeof(VALUE))
#define RBASIC_SET_CLASS_RAW(obj, cls) memcpy(&((struct RBasicRaw *)((VALUE)(obj)))->klass, &(cls), sizeof(VALUE))
#define RBASIC_SET_CLASS(obj, cls) do { \
VALUE _obj_ = (obj); \