diff --git a/src/common/linux/dump_symbols.cc b/src/common/linux/dump_symbols.cc
index 5c2d6254..8c211579 100644
--- a/src/common/linux/dump_symbols.cc
+++ b/src/common/linux/dump_symbols.cc
@@ -223,7 +223,8 @@ int LoadLineInfo(struct nlist *list,
     struct LineInfo line;
     while (cur_list < list_end && cur_list->n_type == N_SLINE) {
       line.rva_to_func = cur_list->n_value;
-      line.line_num = cur_list->n_desc;
+      // n_desc is a signed short
+      line.line_num = (unsigned short)cur_list->n_desc;
       func_info->line_info.push_back(line);
       ++cur_list;
     }