diff --git a/src/newgdi/shape-glyphs-basic.c b/src/newgdi/shape-glyphs-basic.c
index 90362c60..ff8cd8d5 100644
--- a/src/newgdi/shape-glyphs-basic.c
+++ b/src/newgdi/shape-glyphs-basic.c
@@ -154,6 +154,7 @@ static BOOL shape_layout_run(SEInstance* inst,
     }
 
     // generate the glyphs
+#if 0
     gs->glyphs = malloc(sizeof(ShapedGlyph) * nr_ucs);
     if (gs->glyphs == NULL) {
         goto out;
@@ -163,6 +164,10 @@ static BOOL shape_layout_run(SEInstance* inst,
         free(gs->glyphs);
         goto out;
     }
+#else
+    // must use __mg_glyph_string_set_size
+    __mg_glyph_string_set_size(gs, nr_ucs);
+#endif
 
     j = 0;
     for (i = 0; i < nr_ucs; i++) {
diff --git a/src/newgdi/shape-glyphs-complex.c b/src/newgdi/shape-glyphs-complex.c
index 8f1187c6..664cca90 100644
--- a/src/newgdi/shape-glyphs-complex.c
+++ b/src/newgdi/shape-glyphs-complex.c
@@ -245,6 +245,7 @@ static BOOL shape_layout_run(SEInstance* inst,
     }
 
     // generate result
+#if 0
     assert(gs->glyphs == NULL);
     assert(gs->log_clusters == NULL);
 
@@ -257,6 +258,10 @@ static BOOL shape_layout_run(SEInstance* inst,
         free(gs->glyphs);
         goto error;
     }
+#else
+    // must use __mg_glyph_string_set_size
+    __mg_glyph_string_set_size(gs, nr_glyphs);
+#endif
 
     last_cluster = -1;
     gs->nr_glyphs = nr_glyphs;