diff --git a/src/hb-wasm-api-face.hh b/src/hb-wasm-api-face.hh
index 30d21aa21..cdbc08d6d 100644
--- a/src/hb-wasm-api-face.hh
+++ b/src/hb-wasm-api-face.hh
@@ -50,6 +50,15 @@ face_reference_table (HB_WASM_EXEC_ENV_COMPOUND
   hb_blob_destroy (blob);
 }
 
+unsigned
+face_get_upem (HB_WASM_EXEC_ENV
+	       ptr_t(face_t) faceref)
+{
+  HB_REF2OBJ (face);
+
+  return hb_face_get_upem (face);
+}
+
 
 }}
 
diff --git a/src/hb-wasm-api-list.hh b/src/hb-wasm-api-list.hh
index cb60ee76a..7a833d900 100644
--- a/src/hb-wasm-api-list.hh
+++ b/src/hb-wasm-api-list.hh
@@ -62,6 +62,7 @@ static NativeSymbol _hb_wasm_native_symbols[] =
 
   /* face */
   NATIVE_SYMBOL ("(iii)",	face_reference_table),
+  NATIVE_SYMBOL ("(i)i",	face_get_upem),
 
   /* font */
   NATIVE_SYMBOL ("(i)i",	font_get_face),
diff --git a/src/hb-wasm-api.h b/src/hb-wasm-api.h
index 405189ed3..f7162fbe7 100644
--- a/src/hb-wasm-api.h
+++ b/src/hb-wasm-api.h
@@ -140,6 +140,9 @@ HB_WASM_API_COMPOUND (blob_t, face_reference_table) (HB_WASM_EXEC_ENV_COMPOUND
 						     ptr_t(face_t),
 						     tag_t table_tag);
 
+HB_WASM_API (unsigned, face_get_upem) (HB_WASM_EXEC_ENV
+				       ptr_t(face_t));
+
 
 /* font */
 
@@ -160,6 +163,8 @@ HB_WASM_API (hb_position_t, font_get_glyph_h_advance) (HB_WASM_EXEC_ENV
 HB_WASM_API (hb_position_t, font_get_glyph_v_advance) (HB_WASM_EXEC_ENV
 						       ptr_t(font_t),
 						       hb_codepoint_t glyph);
+
+
 /* shape interface */
 
 HB_WASM_INTERFACE (bool_t, shape) (HB_WASM_EXEC_ENV
diff --git a/src/wasm-graphite/shape.cc b/src/wasm-graphite/shape.cc
index 963a00651..a4a5e8302 100644
--- a/src/wasm-graphite/shape.cc
+++ b/src/wasm-graphite/shape.cc
@@ -85,7 +85,7 @@ shape (font_t *font, buffer_t *buffer)
   memset (clusters, 0, sizeof (clusters[0]) * length);
   hb_codepoint_t *pg = gids;
   clusters[0].cluster = contents.info[0].cluster;
-  unsigned int upem = 2048;//hb_face_get_upem (face);
+  unsigned int upem = face_get_upem (face);
   float xscale = 10;//(float) font->x_scale / upem;
   float yscale = 10;//(float) font->y_scale / upem;
   yscale *= yscale / xscale;
@@ -196,7 +196,7 @@ shape (font_t *font, buffer_t *buffer)
       pPos->x_offset = gr_slot_origin_X (is) * xscale - info->var1 - curradvx + pPos->x_advance;
       pPos->y_offset = gr_slot_origin_Y (is) * yscale - curradvy;
     }
-    //hb_buffer_reverse_clusters (buffer);
+    //buffer_reverse_clusters (buffer);
   }
 
   gr_seg_destroy (seg);