diff --git a/extern/ttconv/pprdrv_tt.cpp b/extern/ttconv/pprdrv_tt.cpp
index 934215470808..a1b6d3799b64 100644
--- a/extern/ttconv/pprdrv_tt.cpp
+++ b/extern/ttconv/pprdrv_tt.cpp
@@ -841,17 +841,24 @@ void ttfont_sfnts(TTStreamWriter& stream, struct TTFONT *font)
/* Now, generate those silly numTables numbers. */
sfnts_pputUSHORT(stream, count); /* number of tables */
- if ( count == 9 )
- {
- sfnts_pputUSHORT(stream, 7); /* searchRange */
- sfnts_pputUSHORT(stream, 3); /* entrySelector */
- sfnts_pputUSHORT(stream, 81); /* rangeShift */
+
+ int search_range = 1;
+ int entry_sel = 0;
+
+ while (search_range <= count) {
+ search_range <<= 1;
+ entry_sel++;
}
+ entry_sel = entry_sel > 0 ? entry_sel - 1 : 0;
+ search_range = (search_range >> 1) * 16;
+ int range_shift = count * 16 - search_range;
+
+ sfnts_pputUSHORT(stream, search_range); /* searchRange */
+ sfnts_pputUSHORT(stream, entry_sel); /* entrySelector */
+ sfnts_pputUSHORT(stream, range_shift); /* rangeShift */
+
#ifdef DEBUG_TRUETYPE
- else
- {
- debug("only %d tables selected",count);
- }
+ debug("only %d tables selected",count);
#endif
/* Now, emmit the table directory. */
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