diff --git a/src/hb-blob.cc b/src/hb-blob.cc
index f90f97e..3cc2d9d 100644
--- a/src/hb-blob.cc
+++ b/src/hb-blob.cc
@@ -48,6 +48,7 @@
 
 struct _hb_blob_t {
   hb_object_header_t header;
+  ASSERT_POD ();
 
   bool immutable;
 
diff --git a/src/hb-buffer-private.hh b/src/hb-buffer-private.hh
index fb1c801..b539f26 100644
--- a/src/hb-buffer-private.hh
+++ b/src/hb-buffer-private.hh
@@ -44,11 +44,13 @@
     hb_direction_t      direction;
     hb_script_t         script;
     hb_language_t       language;
+    ASSERT_POD ();
 } hb_segment_properties_t;
 
 
 struct _hb_buffer_t {
   hb_object_header_t header;
+  ASSERT_POD ();
 
   /* Information about how the text in the buffer should be treated */
 
diff --git a/src/hb-font-private.hh b/src/hb-font-private.hh
index e10e105..91a4304 100644
--- a/src/hb-font-private.hh
+++ b/src/hb-font-private.hh
@@ -56,6 +56,7 @@
 
 struct _hb_font_funcs_t {
   hb_object_header_t header;
+  ASSERT_POD ();
 
   hb_bool_t immutable;
 
@@ -87,6 +88,7 @@
 
 struct _hb_face_t {
   hb_object_header_t header;
+  ASSERT_POD ();
 
   hb_bool_t immutable;
 
@@ -107,6 +109,7 @@
 
 struct _hb_font_t {
   hb_object_header_t header;
+  ASSERT_POD ();
 
   hb_bool_t immutable;
 
diff --git a/src/hb-object-private.hh b/src/hb-object-private.hh
index e86a38d..96d1bd3 100644
--- a/src/hb-object-private.hh
+++ b/src/hb-object-private.hh
@@ -173,6 +173,8 @@
 	       this ? ref_count.ref_count : 0);
   }
 
+  private:
+  ASSERT_POD ();
 };
 
 
diff --git a/src/hb-private.hh b/src/hb-private.hh
index 8f821f2..2ea0442 100644
--- a/src/hb-private.hh
+++ b/src/hb-private.hh
@@ -122,7 +122,7 @@
 /* Check _assertion in a method environment */
 #define _ASSERT_POD1(_line) \
   inline void _static_assertion_on_line_##_line (void) const \
-  { _ASSERT_INSTANCE_POD1 (*this); /* Make sure it's POD. */ }
+  { _ASSERT_INSTANCE_POD1 (_line, *this); /* Make sure it's POD. */ }
 # define _ASSERT_POD0(_line) _ASSERT_POD1 (_line)
 # define ASSERT_POD() _ASSERT_POD0 (__LINE__)
 
diff --git a/src/hb-set-private.hh b/src/hb-set-private.hh
index b8407e9..5cdf8a0 100644
--- a/src/hb-set-private.hh
+++ b/src/hb-set-private.hh
@@ -36,6 +36,9 @@
 
 struct _hb_set_t
 {
+  hb_object_header_t header;
+  ASSERT_POD ();
+
   inline void init (void) {
     header.init ();
     clear ();
@@ -158,7 +161,6 @@
   elt_t elt (hb_codepoint_t g) const { return elts[g >> SHIFT]; }
   elt_t mask (hb_codepoint_t g) const { return elt_t (1) << (g & MASK); }
 
-  hb_object_header_t header;
   elt_t elts[ELTS]; /* XXX 8kb */
 
   ASSERT_STATIC (sizeof (elt_t) * 8 == BITS);
diff --git a/src/hb-unicode-private.hh b/src/hb-unicode-private.hh
index 7f719c4..8a34174 100644
--- a/src/hb-unicode-private.hh
+++ b/src/hb-unicode-private.hh
@@ -63,6 +63,7 @@
 
 struct _hb_unicode_funcs_t {
   hb_object_header_t header;
+  ASSERT_POD ();
 
   hb_unicode_funcs_t *parent;