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-rw-r--r--erts/emulator/beam/erl_bits.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/erts/emulator/beam/erl_bits.h b/erts/emulator/beam/erl_bits.h
index e3f8e0b679..d482d325a1 100644
--- a/erts/emulator/beam/erl_bits.h
+++ b/erts/emulator/beam/erl_bits.h
@@ -63,7 +63,7 @@ typedef struct erl_bin_match_struct{
#define HEADER_NUM_SLOTS(hdr) (header_arity(hdr)-sizeof(ErlBinMatchState)/sizeof(Eterm)+1)
#define make_matchstate(_Ms) make_boxed((Eterm*)(_Ms))
-#define ms_matchbuffer(_Ms) &(((ErlBinMatchState*)(_Ms - TAG_PRIMARY_BOXED))->mb)
+#define ms_matchbuffer(_Ms) &(((ErlBinMatchState*) boxed_val(_Ms))->mb)
#if defined(ERTS_SMP)