diff --git a/src/bitmap.c b/src/bitmap.c
index 66ebc157..2021286b 100644
--- a/src/bitmap.c
+++ b/src/bitmap.c
@@ -655,7 +655,7 @@ static inline bool mi_bchunk_try_find_and_clear(mi_bchunk_t* chunk, size_t* pidx
     const uint32x4_t vzero1x   = vreinterpretq_u32_u64(vshrq_n_u64(vreinterpretq_u64_u32(vzero1), 24));        // shift-right 2x32bit elem by 24: lo 16 bits contain the 2 lo bytes
     const uint32x4_t vzero2x   = vreinterpretq_u32_u64(vshrq_n_u64(vreinterpretq_u64_u32(vzero2), 24));
     const uint16x8_t vzero12   = vreinterpretq_u16_u32(vuzp1q_u32(vzero1x,vzero2x));                           // unzip even 32-bit elements into one vector
-    const uint8x8_t  vzero     = vmovn_u32(vzero12);                                                           // narrow the bottom 16-bits
+    const uint8x8_t  vzero     = vmovn_u16(vzero12);                                                           // narrow the bottom 16-bits
     const uint64_t mask = ~vget_lane_u64(vreinterpret_u64_u8(vzero), 0);  // 1 byte for each bfield (0xFF => bfield has a bit set)
     if (mask==0) return false;
     mi_assert_internal((mi_ctz(mask)%8) == 0); // tzcnt == 0, 8, 16, 24 , ..