Fix bit set op of non-atomic fallback in atomic API

1 files changed, 2 insertions, 0 deletions

diff --git a/erts/emulator/beam/erl_threads.h b/erts/emulator/beam/erl_threads.h
index 0e759a1eec..1dc3ffeb3c 100644
--- a/erts/emulator/beam/erl_threads.h
+++ b/erts/emulator/beam/erl_threads.h
@@ -2138,6 +2138,7 @@ erts_no_atomic_read_bset(erts_no_atomic_t *var,
 			 erts_aint_t set)
 {
     erts_aint_t old = *var;
+    *var &= ~mask;
     *var |= (mask & set);
     return old;
 }
@@ -2235,6 +2236,7 @@ erts_no_atomic32_read_bset(erts_no_atomic32_t *var,
 			   erts_aint32_t set)
 {
     erts_aint32_t old = *var;
+    *var &= ~mask;
     *var |= (mask & set);
     return old;
 }