diff --git a/src/hb-buffer.cc b/src/hb-buffer.cc
index 3c54f7243..0e293f6b5 100644
--- a/src/hb-buffer.cc
+++ b/src/hb-buffer.cc
@@ -218,9 +218,6 @@ hb_buffer_t::get_scratch_buffer (unsigned int *size)
 void
 hb_buffer_t::reset ()
 {
-  if (unlikely (hb_object_is_immutable (this)))
-    return;
-
   hb_unicode_funcs_destroy (unicode);
   unicode = hb_unicode_funcs_reference (hb_unicode_funcs_get_default ());
   flags = HB_BUFFER_FLAG_DEFAULT;
@@ -233,9 +230,6 @@ hb_buffer_t::reset ()
 void
 hb_buffer_t::clear ()
 {
-  if (unlikely (hb_object_is_immutable (this)))
-    return;
-
   hb_segment_properties_t default_props = HB_SEGMENT_PROPERTIES_DEFAULT;
   props = default_props;
   scratch_flags = HB_BUFFER_SCRATCH_FLAG_DEFAULT;
@@ -290,9 +284,6 @@ hb_buffer_t::add_info (const hb_glyph_info_t &glyph_info)
 void
 hb_buffer_t::remove_output ()
 {
-  if (unlikely (hb_object_is_immutable (this)))
-    return;
-
   have_output = false;
   have_positions = false;
 
@@ -303,9 +294,6 @@ hb_buffer_t::remove_output ()
 void
 hb_buffer_t::clear_output ()
 {
-  if (unlikely (hb_object_is_immutable (this)))
-    return;
-
   have_output = true;
   have_positions = false;
 
@@ -316,9 +304,6 @@ hb_buffer_t::clear_output ()
 void
 hb_buffer_t::clear_positions ()
 {
-  if (unlikely (hb_object_is_immutable (this)))
-    return;
-
   have_output = false;
   have_positions = true;
 
@@ -1226,6 +1211,9 @@ hb_buffer_get_invisible_glyph (hb_buffer_t    *buffer)
 void
 hb_buffer_reset (hb_buffer_t *buffer)
 {
+  if (unlikely (hb_object_is_immutable (buffer)))
+    return;
+
   buffer->reset ();
 }
 
@@ -1241,6 +1229,9 @@ hb_buffer_reset (hb_buffer_t *buffer)
 void
 hb_buffer_clear_contents (hb_buffer_t *buffer)
 {
+  if (unlikely (hb_object_is_immutable (buffer)))
+    return;
+
   buffer->clear ();
 }
 
diff --git a/src/hb-map.cc b/src/hb-map.cc
index aabf713d5..f115da2bb 100644
--- a/src/hb-map.cc
+++ b/src/hb-map.cc
@@ -253,6 +253,9 @@ hb_map_has (const hb_map_t *map,
 void
 hb_map_clear (hb_map_t *map)
 {
+  if (unlikely (hb_object_is_immutable (map)))
+    return;
+
   return map->clear ();
 }
 
diff --git a/src/hb-map.hh b/src/hb-map.hh
index 92c1bd67e..82fa3ccf8 100644
--- a/src/hb-map.hh
+++ b/src/hb-map.hh
@@ -97,8 +97,6 @@ struct hb_hashmap_t
 
   void reset ()
   {
-    if (unlikely (hb_object_is_immutable (this)))
-      return;
     successful = true;
     clear ();
   }
@@ -171,8 +169,6 @@ struct hb_hashmap_t
 
   void clear ()
   {
-    if (unlikely (hb_object_is_immutable (this)))
-      return;
     if (items)
       for (auto &_ : hb_iter (items, mask + 1))
 	_.clear ();
diff --git a/src/hb-set.cc b/src/hb-set.cc
index 55e3b9025..86bf70034 100644
--- a/src/hb-set.cc
+++ b/src/hb-set.cc
@@ -183,6 +183,9 @@ hb_set_allocation_successful (const hb_set_t  *set)
 void
 hb_set_clear (hb_set_t *set)
 {
+  if (unlikely (hb_object_is_immutable (set)))
+    return;
+
   set->clear ();
 }
 
diff --git a/src/hb-set.hh b/src/hb-set.hh
index c524b5d31..3b100f609 100644
--- a/src/hb-set.hh
+++ b/src/hb-set.hh
@@ -256,17 +256,12 @@ struct hb_set_t
 
   void reset ()
   {
-    if (unlikely (hb_object_is_immutable (this)))
-      return;
     successful = true;
     clear ();
   }
 
   void clear ()
   {
-    if (unlikely (hb_object_is_immutable (this)))
-      return;
-
     if (resize (0))
       population = 0;
   }