diff --git a/crypto/bytestring/bytestring_test.cc b/crypto/bytestring/bytestring_test.cc
index b2b20d7..12275d6 100644
--- a/crypto/bytestring/bytestring_test.cc
+++ b/crypto/bytestring/bytestring_test.cc
@@ -907,7 +907,7 @@
 
   static const std::vector<uint8_t> kInvalidBitStrings[] = {
       // BIT STRINGs always have a leading byte.
-      {},
+      std::vector<uint8_t>{},
       // It's not possible to take an unused bit off the empty string.
       {0x01},
       // There can be at most 7 unused bits.