diff --git a/include/spdlog/common.h b/include/spdlog/common.h
index 4a9110b6..350ae08b 100644
--- a/include/spdlog/common.h
+++ b/include/spdlog/common.h
@@ -193,7 +193,7 @@ struct source_loc
     }
     SPDLOG_CONSTEXPR source_loc(const char *filename, int line)
         : filename(filename)
-        , line(line)
+        , line(static_cast<uint32_t>(line))
     {
     }