diff --git a/src/hb-ot-layout.cc b/src/hb-ot-layout.cc
index d32be04a812770a907fbdf7ecbf8354a4414769f..1365a3e21d8466b6855744b221ef9a9674651e9f 100644
--- a/src/hb-ot-layout.cc
+++ b/src/hb-ot-layout.cc
@@ -957,19 +957,6 @@ hb_ot_layout_lookup_would_substitute (hb_face_t            *face,
 				      const hb_codepoint_t *glyphs,
 				      unsigned int          glyphs_length,
 				      hb_bool_t             zero_context)
-{
-  return hb_ot_layout_lookup_would_substitute_fast (face,
-						    lookup_index,
-						    glyphs, glyphs_length,
-						    zero_context);
-}
-
-bool
-hb_ot_layout_lookup_would_substitute_fast (hb_face_t            *face,
-					   unsigned int          lookup_index,
-					   const hb_codepoint_t *glyphs,
-					   unsigned int          glyphs_length,
-					   bool                  zero_context)
 {
   if (unlikely (lookup_index >= face->table.GSUB->lookup_count)) return false;
   OT::hb_would_apply_context_t c (face, glyphs, glyphs_length, (bool) zero_context);
diff --git a/src/hb-ot-layout.hh b/src/hb-ot-layout.hh
index 5125e9fa9203f1acec3f5935ed4c33d625c82b28..be7ef02636bc4b98a8f00b2fdff6533f267d24f6 100644
--- a/src/hb-ot-layout.hh
+++ b/src/hb-ot-layout.hh
@@ -96,13 +96,6 @@ HB_MARK_AS_FLAG_T (hb_ot_layout_glyph_props_flags_t);
  * GSUB/GPOS
  */
 
-HB_INTERNAL bool
-hb_ot_layout_lookup_would_substitute_fast (hb_face_t            *face,
-					   unsigned int          lookup_index,
-					   const hb_codepoint_t *glyphs,
-					   unsigned int          glyphs_length,
-					   bool                  zero_context);
-
 
 /* Should be called before all the substitute_lookup's are done. */
 HB_INTERNAL void
diff --git a/src/hb-ot-shape-complex-indic.cc b/src/hb-ot-shape-complex-indic.cc
index 1c7bba5e85625d00ff7e56aec7c6fb52c5ecb562..d421555fbd14820bae748fb6d7e233a2790ad803 100644
--- a/src/hb-ot-shape-complex-indic.cc
+++ b/src/hb-ot-shape-complex-indic.cc
@@ -239,7 +239,7 @@ struct would_substitute_feature_t
 			 hb_face_t            *face) const
   {
     for (unsigned int i = 0; i < count; i++)
-      if (hb_ot_layout_lookup_would_substitute_fast (face, lookups[i].index, glyphs, glyphs_count, zero_context))
+      if (hb_ot_layout_lookup_would_substitute (face, lookups[i].index, glyphs, glyphs_count, zero_context))
 	return true;
     return false;
   }
diff --git a/src/hb-ot-shape-complex-khmer.cc b/src/hb-ot-shape-complex-khmer.cc
index 0bc2309bff43df4fdf65d92ff46256ba501a5f2c..5746651d661f5c0e0fe2ff1c8bcafb990d8908aa 100644
--- a/src/hb-ot-shape-complex-khmer.cc
+++ b/src/hb-ot-shape-complex-khmer.cc
@@ -164,7 +164,7 @@ struct would_substitute_feature_t
 			 hb_face_t            *face) const
   {
     for (unsigned int i = 0; i < count; i++)
-      if (hb_ot_layout_lookup_would_substitute_fast (face, lookups[i].index, glyphs, glyphs_count, zero_context))
+      if (hb_ot_layout_lookup_would_substitute (face, lookups[i].index, glyphs, glyphs_count, zero_context))
 	return true;
     return false;
   }