diff --git a/xo-imgui/include/imgui/imstb_truetype.h b/xo-imgui/include/imgui/imstb_truetype.h
index 35c827e6..619e698a 100644
--- a/xo-imgui/include/imgui/imstb_truetype.h
+++ b/xo-imgui/include/imgui/imstb_truetype.h
@@ -2145,6 +2145,7 @@ static int stbtt__run_charstring(const stbtt_fontinfo *info, int glyph_index, st
             has_subrs = 1;
          }
          // FALLTHROUGH
+          [[fallthrough]];
       case 0x1D: // callgsubr
          if (sp < 1) return STBTT__CSERR("call(g|)subr stack");
          v = (int) s[--sp];