diff --git a/runtime/base/bit_vector.cc b/runtime/base/bit_vector.cc
index 4390180..c3e24a7 100644
--- a/runtime/base/bit_vector.cc
+++ b/runtime/base/bit_vector.cc
@@ -276,6 +276,10 @@
   }
 }
 
+#if defined(__clang__) && defined(__ARM_64BIT_STATE)
+// b/19180814 When POPCOUNT is inlined, boot up failed on arm64 devices.
+__attribute__((optnone))
+#endif
 uint32_t BitVector::NumSetBits(const uint32_t* storage, uint32_t end) {
   uint32_t word_end = WordIndex(end);
   uint32_t partial_word_bits = end & 0x1f;