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diff --git a/lib/alg-yescrypt-opt.c b/lib/alg-yescrypt-opt.c
index 60a6ccd..a33c6e4 100644
--- a/lib/alg-yescrypt-opt.c
+++ b/lib/alg-yescrypt-opt.c
@@ -514,7 +514,7 @@ static volatile uint64_t Smask2var = Smask2;
#define PWXFORM_SIMD(X) { \
uint64_t x; \
FORCE_REGALLOC_1 \
- uint32_t lo = x = EXTRACT64(X) & Smask2reg; \
+ uint32_t lo = (uint32_t)(x = ((uint64_t)EXTRACT64(X)) & Smask2reg); \
FORCE_REGALLOC_2 \
uint32_t hi = x >> 32; \
X = _mm_mul_epu32(HI32(X), X); \
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