diff --git a/include/spdlog/common.h b/include/spdlog/common.h
index 5bd24c0f..3bd9e7d9 100644
--- a/include/spdlog/common.h
+++ b/include/spdlog/common.h
@@ -197,8 +197,13 @@ struct source_loc
         , line(line)
     {
     }
-    const char *const filename;
-    const uint32_t line;
+//
+//    source_loc (const source_loc&) = default;
+//    source_loc& operator=(const source_loc&) = default;
+//    source_loc& operator=(source_loc&&) = default;
+
+    const char *filename;
+    uint32_t line;
 };
 
 namespace details {
diff --git a/include/spdlog/details/thread_pool.h b/include/spdlog/details/thread_pool.h
index a1c07d3f..35578971 100644
--- a/include/spdlog/details/thread_pool.h
+++ b/include/spdlog/details/thread_pool.h
@@ -33,6 +33,7 @@ struct async_msg
     fmt::basic_memory_buffer<char, 176> raw;
 
     size_t msg_id;
+    source_loc source;
     async_logger_ptr worker_ptr;
 
     async_msg() = default;
@@ -49,6 +50,7 @@ struct async_msg
                                                    thread_id(other.thread_id),
                                                    raw(move(other.raw)),
                                                    msg_id(other.msg_id),
+                                                   source(other.source),
                                                    worker_ptr(std::move(other.worker_ptr))
     {
     }
@@ -61,6 +63,7 @@ struct async_msg
         thread_id = other.thread_id;
         raw = std::move(other.raw);
         msg_id = other.msg_id;
+        source = other.source;
         worker_ptr = std::move(other.worker_ptr);
         return *this;
     }
@@ -76,6 +79,7 @@ struct async_msg
         , time(m.time)
         , thread_id(m.thread_id)
         , msg_id(m.msg_id)
+        , source(m.source)
         , worker_ptr(std::move(worker))
     {
         fmt_helper::append_string_view(m.payload, raw);
@@ -87,6 +91,7 @@ struct async_msg
         , time()
         , thread_id(0)
         , msg_id(0)
+        , source()
         , worker_ptr(std::move(worker))
     {
     }
@@ -103,6 +108,7 @@ struct async_msg
         msg.time = time;
         msg.thread_id = thread_id;
         msg.msg_id = msg_id;
+        msg.source = source;
         msg.color_range_start = 0;
         msg.color_range_end = 0;
         return msg;