diff --git a/test/api/fonts/cff1_flex.otf b/test/api/fonts/cff1_flex.otf
new file mode 100644
index 000000000..1ef59e126
Binary files /dev/null and b/test/api/fonts/cff1_flex.otf differ
diff --git a/test/api/test-ot-extents-cff.c b/test/api/test-ot-extents-cff.c
index aa2dd7ce2..1c1cb84b1 100644
--- a/test/api/test-ot-extents-cff.c
+++ b/test/api/test-ot-extents-cff.c
@@ -91,6 +91,28 @@ test_extents_cff1_legacyops (void)
   hb_font_destroy (font);
 }
 
+static void
+test_extents_cff1_flex (void)
+{
+  hb_face_t *face = hb_subset_test_open_font ("fonts/cff1_flex.otf");
+  g_assert (face);
+  hb_font_t *font = hb_font_create (face);
+  hb_face_destroy (face);
+  g_assert (font);
+  hb_ot_font_set_funcs (font);
+
+  hb_glyph_extents_t  extents;
+  hb_bool_t result = hb_font_get_glyph_extents (font, 1, &extents);
+  g_assert (result);
+
+  g_assert_cmpint (extents.x_bearing, ==, -20);
+  g_assert_cmpint (extents.y_bearing, ==, 520);
+  g_assert_cmpint (extents.width, ==, 540);
+  g_assert_cmpint (extents.height, ==, -540);
+
+  hb_font_destroy (font);
+}
+
 static void
 test_extents_cff2 (void)
 {
@@ -162,6 +184,7 @@ main (int argc, char **argv)
 
   hb_test_add (test_extents_cff1);
   hb_test_add (test_extents_cff1_legacyops);
+  hb_test_add (test_extents_cff1_flex);
   hb_test_add (test_extents_cff2);
   hb_test_add (test_extents_cff2_vsindex);