1 files changed, 4 insertions, 5 deletions
diff --git a/tests/fuzz/levin.cpp b/tests/fuzz/levin.cpp
index 012d05f36..b090c350b 100644
--- a/tests/fuzz/levin.cpp
+++ b/tests/fuzz/levin.cpp
@@ -65,13 +65,13 @@ namespace
     {
     }
 
-    virtual int invoke(int command, const epee::span<const uint8_t> in_buff, std::string& buff_out, test_levin_connection_context& context)
+    virtual int invoke(int command, const epee::span<const uint8_t> in_buff, epee::byte_slice& buff_out, test_levin_connection_context& context)
     {
       m_invoke_counter.inc();
       boost::unique_lock<boost::mutex> lock(m_mutex);
       m_last_command = command;
       m_last_in_buf = std::string((const char*)in_buff.data(), in_buff.size());
-      buff_out = m_invoke_out_buf;
+      buff_out = m_invoke_out_buf.clone();
       return m_return_code;
     }
 
@@ -111,8 +111,7 @@ namespace
     int return_code() const { return m_return_code; }
     void return_code(int v) { m_return_code = v; }
 
-    const std::string& invoke_out_buf() const { return m_invoke_out_buf; }
-    void invoke_out_buf(const std::string& v) { m_invoke_out_buf = v; }
+    void invoke_out_buf(std::string v) { m_invoke_out_buf = epee::byte_slice{std::move(v)}; }
 
     int last_command() const { return m_last_command; }
     const std::string& last_in_buf() const { return m_last_in_buf; }
@@ -127,7 +126,7 @@ namespace
     boost::mutex m_mutex;
 
     int m_return_code;
-    std::string m_invoke_out_buf;
+    epee::byte_slice m_invoke_out_buf;
 
     int m_last_command;
     std::string m_last_in_buf;