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-rw-r--r--src/lib/math/bigint/bigint.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/lib/math/bigint/bigint.cpp b/src/lib/math/bigint/bigint.cpp
index 75c87e5b6..065c469b4 100644
--- a/src/lib/math/bigint/bigint.cpp
+++ b/src/lib/math/bigint/bigint.cpp
@@ -280,6 +280,7 @@ size_t BigInt::top_bits_free() const
const word top_word = word_at(words - 1);
const size_t bits_used = high_bit(top_word);
+ CT::unpoison(bits_used);
return BOTAN_MP_WORD_BITS - bits_used;
}