diff --git a/tccdbg.c b/tccdbg.c
index 7760f4fd..15d54b47 100644
--- a/tccdbg.c
+++ b/tccdbg.c
@@ -802,7 +802,7 @@ ST_FUNC void tcc_debug_start(TCCState *s1)
 
             dwarf_data1(dwarf_info_section, DWARF_ABBREV_COMPILE_UNIT);
             dwarf_strp(dwarf_info_section, "tcc " TCC_VERSION);
-            dwarf_data1(dwarf_info_section, DW_LANG_C11);
+            dwarf_data1(dwarf_info_section, s1->cversion == 201112 ? DW_LANG_C11 : DW_LANG_C99);
             dwarf_line_strp(dwarf_info_section, filename);
             dwarf_line_strp(dwarf_info_section, buf);
             dwarf_reloc(dwarf_info_section, section_sym, R_DATA_PTR);