diff --git a/src/hb-ot-shape-complex-khmer.hh b/src/hb-ot-shape-complex-khmer.hh
index 3371c1302..c86e7aad6 100644
--- a/src/hb-ot-shape-complex-khmer.hh
+++ b/src/hb-ot-shape-complex-khmer.hh
@@ -59,18 +59,6 @@ matra_position_khmer (khmer_position_t side)
   };
 }
 
-static inline bool
-is_consonant_or_vowel (const hb_glyph_info_t &info)
-{
-  return is_one_of (info, CONSONANT_FLAGS | FLAG (OT_V));
-}
-
-static inline bool
-is_coeng (const hb_glyph_info_t &info)
-{
-  return is_one_of (info, FLAG (OT_Coeng));
-}
-
 static inline void
 set_khmer_properties (hb_glyph_info_t &info)
 {