diff --git a/be/src/util/simd/bits.h b/be/src/util/simd/bits.h
index b907ebb5ef..09b1fe519b 100644
--- a/be/src/util/simd/bits.h
+++ b/be/src/util/simd/bits.h
@@ -46,7 +46,7 @@ inline uint32_t bytes32_mask_to_bits32_mask(const uint8_t* data) {
              0xffff0000);
 #else
     uint32_t mask = 0;
-    for (size_t i = 0; i < 32; ++i) {
+    for (std::size_t i = 0; i < 32; ++i) {
         mask |= static_cast<uint32_t>(1 == *(data + i)) << i;
     }
 #endif
@@ -58,4 +58,4 @@ inline uint32_t bytes32_mask_to_bits32_mask(const bool* data) {
 }
 
 } // namespace simd
-} // namespace doris
\ No newline at end of file
+} // namespace doris