diff --git a/src/GdbServerConnection.cc b/src/GdbServerConnection.cc
index eba06202da7..6961a7b077e 100644
--- a/src/GdbServerConnection.cc
+++ b/src/GdbServerConnection.cc
@@ -1921,7 +1921,7 @@ void GdbServerConnection::reply_get_mem(const vector<uint8_t>& mem) {
     } else if (!mem.size()) {
       write_packet("E01");
     } else {
-      write_binary_packet("", mem.data(), mem.size());
+      write_binary_packet("b", mem.data(), mem.size());
     }
   }