diff --git a/src/OT/glyf/CompositeGlyph.hh b/src/OT/glyf/CompositeGlyph.hh
index fc8e309bc..c5f563c78 100644
--- a/src/OT/glyf/CompositeGlyph.hh
+++ b/src/OT/glyf/CompositeGlyph.hh
@@ -121,7 +121,7 @@ struct CompositeGlyphRecord
     if (flags & ARG_1_AND_2_ARE_WORDS)
     {
       // no overflow, copy and update value with deltas
-      memcpy (out, this, len);
+      hb_memcpy (out, this, len);
 
       const HBINT16 *px = reinterpret_cast<const HBINT16 *> (p);
       HBINT16 *o = reinterpret_cast<HBINT16 *> (out + len_before_val);
@@ -135,7 +135,7 @@ struct CompositeGlyphRecord
       if (new_x <= 127 && new_x >= -128 &&
           new_y <= 127 && new_y >= -128)
       {
-        memcpy (out, this, len);
+        hb_memcpy (out, this, len);
         HBINT8 *o = reinterpret_cast<HBINT8 *> (out + len_before_val);
         o[0] = new_x;
         o[1] = new_y;
@@ -143,7 +143,7 @@ struct CompositeGlyphRecord
       else
       {
         // int8 overflows after deltas applied
-        memcpy (out, this, len_before_val);
+        hb_memcpy (out, this, len_before_val);
         
         //update flags
         CompositeGlyphRecord *o = reinterpret_cast<CompositeGlyphRecord *> (out);
@@ -152,14 +152,14 @@ struct CompositeGlyphRecord
 
         HBINT16 new_value;
         new_value = new_x;
-        memcpy (out, &new_value, HBINT16::static_size);
+        hb_memcpy (out, &new_value, HBINT16::static_size);
         out += HBINT16::static_size;
 
         new_value = new_y;
-        memcpy (out, &new_value, HBINT16::static_size);
+        hb_memcpy (out, &new_value, HBINT16::static_size);
         out += HBINT16::static_size;
 
-        memcpy (out, p+2, len - len_before_val - 2);
+        hb_memcpy (out, p+2, len - len_before_val - 2);
         len += 2;
       }
     }
@@ -382,7 +382,7 @@ struct CompositeGlyph
       unsigned comp_len = component.get_size ();
       if (component.is_anchored ())
       {
-        memcpy (p, &component, comp_len);
+        hb_memcpy (p, &component, comp_len);
         p += comp_len;
       }
       else
@@ -398,7 +398,7 @@ struct CompositeGlyph
     if (source_len > source_comp_len)
     {
       unsigned instr_len = source_len - source_comp_len;
-      memcpy (p, (const char *)c + source_comp_len, instr_len);
+      hb_memcpy (p, (const char *)c + source_comp_len, instr_len);
       p += instr_len;
     }
 
diff --git a/src/OT/glyf/SimpleGlyph.hh b/src/OT/glyf/SimpleGlyph.hh
index d1d1fc3b3..724e1e2af 100644
--- a/src/OT/glyf/SimpleGlyph.hh
+++ b/src/OT/glyf/SimpleGlyph.hh
@@ -308,24 +308,24 @@ struct SimpleGlyph
 
     const char *src = bytes.arrayZ + GlyphHeader::static_size;
     char *cur = p;
-    memcpy (p, src, len_before_instrs);
+    hb_memcpy (p, src, len_before_instrs);
 
     cur += len_before_instrs;
     src += len_before_instrs;
 
     if (!no_hinting)
     {
-      memcpy (cur, src, len_instrs);
+      hb_memcpy (cur, src, len_instrs);
       cur += len_instrs;
     }
 
-    memcpy (cur, flags.arrayZ, flags.length);
+    hb_memcpy (cur, flags.arrayZ, flags.length);
     cur += flags.length;
 
-    memcpy (cur, x_coords.arrayZ, x_coords.length);
+    hb_memcpy (cur, x_coords.arrayZ, x_coords.length);
     cur += x_coords.length;
 
-    memcpy (cur, y_coords.arrayZ, y_coords.length);
+    hb_memcpy (cur, y_coords.arrayZ, y_coords.length);
 
     dest_bytes = hb_bytes_t (p, total_len);
     return true;
diff --git a/src/graph/gsubgpos-graph.hh b/src/graph/gsubgpos-graph.hh
index 9213cf599..c17063840 100644
--- a/src/graph/gsubgpos-graph.hh
+++ b/src/graph/gsubgpos-graph.hh
@@ -201,7 +201,7 @@ struct Lookup : public OT::Lookup
                       + new_subtable_count * OT::Offset16::static_size;
     char* buffer = (char*) hb_calloc (1, new_size);
     c.add_buffer (buffer);
-    memcpy (buffer, v.obj.head, v.table_size());
+    hb_memcpy (buffer, v.obj.head, v.table_size());
 
     v.obj.head = buffer;
     v.obj.tail = buffer + new_size;
diff --git a/src/graph/pairpos-graph.hh b/src/graph/pairpos-graph.hh
index 041e5069b..1c13eb24f 100644
--- a/src/graph/pairpos-graph.hh
+++ b/src/graph/pairpos-graph.hh
@@ -434,7 +434,7 @@ struct PairPosFormat2 : public OT::Layout::GPOS_impl::PairPosFormat2_4<SmallType
 
     char* start_addr = ((char*)&values[0]) + start * split_context.class1_record_size;
     unsigned num_records = end - start;
-    memcpy (&pair_pos_prime->values[0],
+    hb_memcpy (&pair_pos_prime->values[0],
             start_addr,
             num_records * split_context.class1_record_size);
 
diff --git a/src/graph/serialize.hh b/src/graph/serialize.hh
index a1ec99b15..d03a61bd1 100644
--- a/src/graph/serialize.hh
+++ b/src/graph/serialize.hh
@@ -244,7 +244,7 @@ inline hb_blob_t* serialize (const graph_t& graph)
       return nullptr;
     }
 
-    memcpy (start, vertices[i].obj.head, size);
+    hb_memcpy (start, vertices[i].obj.head, size);
 
     // Only real links needs to be serialized.
     for (const auto& link : vertices[i].obj.real_links)