diff --git a/glib/gbytes.c b/glib/gbytes.c
index ec6923188..00fd79155 100644
--- a/glib/gbytes.c
+++ b/glib/gbytes.c
@@ -95,7 +95,7 @@ g_bytes_new (gconstpointer data,
 {
   g_return_val_if_fail (data != NULL || size == 0, NULL);
 
-  return g_bytes_new_take (g_memdup (data, size), size);
+  return g_bytes_new_take (g_memdup2 (data, size), size);
 }
 
 /**
@@ -499,7 +499,7 @@ g_bytes_unref_to_data (GBytes *bytes,
        * Copy: Non g_malloc (or compatible) allocator, or static memory,
        * so we have to copy, and then unref.
        */
-      result = g_memdup (bytes->data, bytes->size);
+      result = g_memdup2 (bytes->data, bytes->size);
       *size = bytes->size;
       g_bytes_unref (bytes);
     }
diff --git a/glib/gdir.c b/glib/gdir.c
index 6b85e99c8..c26edc1dc 100644
--- a/glib/gdir.c
+++ b/glib/gdir.c
@@ -112,7 +112,7 @@ g_dir_open_with_errno (const gchar *path,
     return NULL;
 #endif
 
-  return g_memdup (&dir, sizeof dir);
+  return g_memdup2 (&dir, sizeof dir);
 }
 
 /**
diff --git a/glib/ghash.c b/glib/ghash.c
index f3ed0f3b9..cc2d00087 100644
--- a/glib/ghash.c
+++ b/glib/ghash.c
@@ -962,7 +962,7 @@ g_hash_table_ensure_keyval_fits (GHashTable *hash_table, gpointer key, gpointer
       if (hash_table->have_big_keys)
         {
           if (key != value)
-            hash_table->values = g_memdup (hash_table->keys, sizeof (gpointer) * hash_table->size);
+            hash_table->values = g_memdup2 (hash_table->keys, sizeof (gpointer) * hash_table->size);
           /* Keys and values are both big now, so no need for further checks */
           return;
         }
@@ -970,7 +970,7 @@ g_hash_table_ensure_keyval_fits (GHashTable *hash_table, gpointer key, gpointer
         {
           if (key != value)
             {
-              hash_table->values = g_memdup (hash_table->keys, sizeof (guint) * hash_table->size);
+              hash_table->values = g_memdup2 (hash_table->keys, sizeof (guint) * hash_table->size);
               is_a_set = FALSE;
             }
         }
@@ -998,7 +998,7 @@ g_hash_table_ensure_keyval_fits (GHashTable *hash_table, gpointer key, gpointer
 
   /* Just split if necessary */
   if (is_a_set && key != value)
-    hash_table->values = g_memdup (hash_table->keys, sizeof (gpointer) * hash_table->size);
+    hash_table->values = g_memdup2 (hash_table->keys, sizeof (gpointer) * hash_table->size);
 
 #endif
 }
diff --git a/glib/giochannel.c b/glib/giochannel.c
index d977b769e..63d7e0314 100644
--- a/glib/giochannel.c
+++ b/glib/giochannel.c
@@ -1673,10 +1673,10 @@ g_io_channel_read_line (GIOChannel  *channel,
 
       /* Copy the read bytes (including any embedded nuls) and nul-terminate.
        * `USE_BUF (channel)->str` is guaranteed to be nul-terminated as it’s a
-       * #GString, so it’s safe to call g_memdup() with +1 length to allocate
+       * #GString, so it’s safe to call g_memdup2() with +1 length to allocate
        * a nul-terminator. */
       g_assert (USE_BUF (channel));
-      line = g_memdup (USE_BUF (channel)->str, got_length + 1);
+      line = g_memdup2 (USE_BUF (channel)->str, got_length + 1);
       line[got_length] = '\0';
       *str_return = g_steal_pointer (&line);
       g_string_erase (USE_BUF (channel), 0, got_length);
diff --git a/glib/gslice.c b/glib/gslice.c
index 589619080..d6335c9dd 100644
--- a/glib/gslice.c
+++ b/glib/gslice.c
@@ -351,7 +351,7 @@ g_slice_get_config_state (GSliceConfig ckey,
       array[i++] = allocator->contention_counters[address];
       array[i++] = allocator_get_magazine_threshold (allocator, address);
       *n_values = i;
-      return g_memdup (array, sizeof (array[0]) * *n_values);
+      return g_memdup2 (array, sizeof (array[0]) * *n_values);
     default:
       return NULL;
     }
diff --git a/glib/gtestutils.c b/glib/gtestutils.c
index 5660fc8be..d24c6e186 100644
--- a/glib/gtestutils.c
+++ b/glib/gtestutils.c
@@ -3966,7 +3966,7 @@ g_test_log_extract (GTestLogBuffer *tbuffer)
       if (p <= tbuffer->data->str + mlength)
         {
           g_string_erase (tbuffer->data, 0, mlength);
-          tbuffer->msgs = g_slist_prepend (tbuffer->msgs, g_memdup (&msg, sizeof (msg)));
+          tbuffer->msgs = g_slist_prepend (tbuffer->msgs, g_memdup2 (&msg, sizeof (msg)));
           return TRUE;
         }
 
diff --git a/glib/gvariant.c b/glib/gvariant.c
index 5584614c6..e48dec1ad 100644
--- a/glib/gvariant.c
+++ b/glib/gvariant.c
@@ -725,7 +725,7 @@ g_variant_new_variant (GVariant *value)
   g_variant_ref_sink (value);
 
   return g_variant_new_from_children (G_VARIANT_TYPE_VARIANT,
-                                      g_memdup (&value, sizeof value),
+                                      g_memdup2 (&value, sizeof value),
                                       1, g_variant_is_trusted (value));
 }
 
@@ -1229,7 +1229,7 @@ g_variant_new_fixed_array (const GVariantType  *element_type,
       return NULL;
     }
 
-  data = g_memdup (elements, n_elements * element_size);
+  data = g_memdup2 (elements, n_elements * element_size);
   value = g_variant_new_from_data (array_type, data,
                                    n_elements * element_size,
                                    FALSE, g_free, data);
@@ -1912,7 +1912,7 @@ g_variant_dup_bytestring (GVariant *value,
   if (length)
     *length = size;
 
-  return g_memdup (original, size + 1);
+  return g_memdup2 (original, size + 1);
 }
 
 /**
diff --git a/glib/gvarianttype.c b/glib/gvarianttype.c
index 831fed4bf..cc97235f3 100644
--- a/glib/gvarianttype.c
+++ b/glib/gvarianttype.c
@@ -1181,7 +1181,7 @@ g_variant_type_new_tuple (const GVariantType * const *items,
   g_assert (offset < sizeof buffer);
   buffer[offset++] = ')';
 
-  return (GVariantType *) g_memdup (buffer, offset);
+  return (GVariantType *) g_memdup2 (buffer, offset);
 }
 
 /**
diff --git a/glib/tests/array-test.c b/glib/tests/array-test.c
index adedfc19f..fef63f672 100644
--- a/glib/tests/array-test.c
+++ b/glib/tests/array-test.c
@@ -1933,7 +1933,7 @@ byte_array_new_take (void)
   GByteArray *gbarray;
   guint8 *data;
 
-  data = g_memdup ("woooweeewow", 11);
+  data = g_memdup2 ("woooweeewow", 11);
   gbarray = g_byte_array_new_take (data, 11);
   g_assert (gbarray->data == data);
   g_assert_cmpuint (gbarray->len, ==, 11);
diff --git a/glib/tests/option-context.c b/glib/tests/option-context.c
index ec66e6f94..042b130af 100644
--- a/glib/tests/option-context.c
+++ b/glib/tests/option-context.c
@@ -257,7 +257,7 @@ join_stringv (int argc, char **argv)
 static char **
 copy_stringv (char **argv, int argc)
 {
-  return g_memdup (argv, sizeof (char *) * (argc + 1));
+  return g_memdup2 (argv, sizeof (char *) * (argc + 1));
 }
 
 static void
@@ -2324,7 +2324,7 @@ test_group_parse (void)
   g_option_context_add_group (context, group);
 
   argv = split_string ("program --test arg1 -f arg2 --group-test arg3 --frob arg4 -z arg5", &argc);
-  orig_argv = g_memdup (argv, (argc + 1) * sizeof (char *));
+  orig_argv = g_memdup2 (argv, (argc + 1) * sizeof (char *));
 
   retval = g_option_context_parse (context, &argc, &argv, &error);
 
diff --git a/glib/tests/uri.c b/glib/tests/uri.c
index 2c610382b..1f3209f97 100644
--- a/glib/tests/uri.c
+++ b/glib/tests/uri.c
@@ -410,7 +410,7 @@ test_uri_unescape_bytes (gconstpointer test_data)
       else
         {
           escaped_len = strlen (tests[i].escaped);  /* no trailing nul */
-          escaped = g_memdup (tests[i].escaped, escaped_len);
+          escaped = g_memdup2 (tests[i].escaped, escaped_len);
         }
 
       bytes = g_uri_unescape_bytes (escaped, escaped_len, tests[i].illegal, &error);
@@ -1591,7 +1591,7 @@ test_uri_iter_params (gconstpointer test_data)
       else
         {
           uri_len = strlen (params_tests[i].uri);  /* no trailing nul */
-          uri = g_memdup (params_tests[i].uri, uri_len);
+          uri = g_memdup2 (params_tests[i].uri, uri_len);
         }
 
       /* Run once without extracting the attr or value, just to check the numbers. */
@@ -1658,7 +1658,7 @@ test_uri_parse_params (gconstpointer test_data)
       else
         {
           uri_len = strlen (params_tests[i].uri);  /* no trailing nul */
-          uri = g_memdup (params_tests[i].uri, uri_len);
+          uri = g_memdup2 (params_tests[i].uri, uri_len);
         }
 
       params = g_uri_parse_params (uri, uri_len, params_tests[i].separators, params_tests[i].flags, &err);