diff --git a/asio/include/asio/buffer.hpp b/asio/include/asio/buffer.hpp
index 14d5ca0e..c41ac0dd 100644
--- a/asio/include/asio/buffer.hpp
+++ b/asio/include/asio/buffer.hpp
@@ -1920,7 +1920,8 @@ inline std::size_t buffer_copy_1(const mutable_buffer& target,
   std::size_t target_size = target.size();
   std::size_t source_size = source.size();
   std::size_t n = target_size < source_size ? target_size : source_size;
-  memcpy(target.data(), source.data(), n);
+  if (n > 0)
+    memcpy(target.data(), source.data(), n);
   return n;
 }
 
diff --git a/asio/include/asio/generic/detail/impl/endpoint.ipp b/asio/include/asio/generic/detail/impl/endpoint.ipp
index cfdfbbff..112c1b2b 100644
--- a/asio/include/asio/generic/detail/impl/endpoint.ipp
+++ b/asio/include/asio/generic/detail/impl/endpoint.ipp
@@ -94,7 +94,8 @@ void endpoint::init(const void* sock_addr,
 
   using namespace std; // For memset and memcpy.
   memset(&data_.generic, 0, sizeof(asio::detail::sockaddr_storage_type));
-  memcpy(&data_.generic, sock_addr, sock_addr_size);
+  if (sock_addr_size > 0)
+    memcpy(&data_.generic, sock_addr, sock_addr_size);
 
   size_ = sock_addr_size;
   protocol_ = sock_protocol;
diff --git a/asio/include/asio/local/detail/impl/endpoint.ipp b/asio/include/asio/local/detail/impl/endpoint.ipp
index 5b06a5e8..af02fead 100644
--- a/asio/include/asio/local/detail/impl/endpoint.ipp
+++ b/asio/include/asio/local/detail/impl/endpoint.ipp
@@ -108,7 +108,8 @@ void endpoint::init(const char* path_name, std::size_t path_length)
   using namespace std; // For memcpy.
   data_.local = asio::detail::sockaddr_un_type();
   data_.local.sun_family = AF_UNIX;
-  memcpy(data_.local.sun_path, path_name, path_length);
+  if (path_length > 0)
+    memcpy(data_.local.sun_path, path_name, path_length);
   path_length_ = path_length;
 
   // NUL-terminate normal path names. Names that start with a NUL are in the