diff --git a/gtk/gtkapplicationaccels.c b/gtk/gtkapplicationaccels.c
index de4aafe378..cdbaafe3cb 100644
--- a/gtk/gtkapplicationaccels.c
+++ b/gtk/gtkapplicationaccels.c
@@ -109,6 +109,7 @@ gtk_application_accels_set_accels_for_action (GtkApplicationAccels *accels,
         }
 
       g_list_store_remove (G_LIST_STORE (accels->shortcuts), i);
+      g_object_unref (shortcut_i);
       break;
     }
 
diff --git a/gtk/gtkcolumnlistitemfactory.c b/gtk/gtkcolumnlistitemfactory.c
index 0b2151f12f..e6188cb4d4 100644
--- a/gtk/gtkcolumnlistitemfactory.c
+++ b/gtk/gtkcolumnlistitemfactory.c
@@ -62,10 +62,12 @@ gtk_column_list_item_factory_setup (GtkListItemFactory *factory,
     {
       GtkColumnViewColumn *column = g_list_model_get_item (columns, i);
 
-      gtk_column_list_item_factory_add_column (self, 
+      gtk_column_list_item_factory_add_column (self,
                                                list_item->owner,
                                                column,
                                                FALSE);
+
+      g_object_unref (column);
     }
 }
 
diff --git a/gtk/gtkcolumnviewsorter.c b/gtk/gtkcolumnviewsorter.c
index 587731e1cd..fa8cf8607a 100644
--- a/gtk/gtkcolumnviewsorter.c
+++ b/gtk/gtkcolumnviewsorter.c
@@ -115,6 +115,14 @@ gtk_column_view_sorter_dispose (GObject *object)
 {
   GtkColumnViewSorter *self = GTK_COLUMN_VIEW_SORTER (object);
 
+  /* The sorter is owned by the columview and is unreffed
+   * after the columns, so the sequence must be empty at
+   * this point.
+   * The sorter can outlive the columview it comes from
+   * (the model might still have a ref), but that does
+   * not change the fact that all columns will be gone.
+   */
+  g_assert (g_sequence_is_empty (self->sorters));
   g_clear_pointer (&self->sorters, g_sequence_free);
 
   G_OBJECT_CLASS (gtk_column_view_sorter_parent_class)->dispose (object);
diff --git a/gtk/gtkfilechoosernativewin32.c b/gtk/gtkfilechoosernativewin32.c
index 68076989fc..7bb3e54b36 100644
--- a/gtk/gtkfilechoosernativewin32.c
+++ b/gtk/gtkfilechoosernativewin32.c
@@ -906,6 +906,7 @@ gtk_file_chooser_native_win32_show (GtkFileChooserNative *self)
               filechooser_win32_thread_data_free (data);
               return FALSE;
             }
+          g_object_unref (filter);
         }
       self->current_filter = gtk_file_chooser_get_filter (GTK_FILE_CHOOSER (self));
     }
diff --git a/gtk/gtkflattenlistmodel.c b/gtk/gtkflattenlistmodel.c
index fe681b265e..f4398d853c 100644
--- a/gtk/gtkflattenlistmodel.c
+++ b/gtk/gtkflattenlistmodel.c
@@ -300,7 +300,7 @@ gtk_flatten_list_model_add_items (GtkFlattenListModel *self,
                         G_CALLBACK (gtk_flatten_list_model_items_changed_cb),
                         node);
       node->list = self;
-      added +=g_list_model_get_n_items (node->model);
+      added += g_list_model_get_n_items (node->model);
     }
 
   return added;
diff --git a/gtk/gtkplacessidebar.c b/gtk/gtkplacessidebar.c
index 7c528252e2..e22d1ca188 100644
--- a/gtk/gtkplacessidebar.c
+++ b/gtk/gtkplacessidebar.c
@@ -767,6 +767,8 @@ add_application_shortcuts (GtkPlacesSidebar *sidebar)
       GFile *file = g_list_model_get_item (G_LIST_MODEL (sidebar->shortcuts), i);
       ShortcutData *data;
 
+      g_object_unref (file);
+
       if (!should_show_file (sidebar, file))
         continue;
 
diff --git a/gtk/gtkprintunixdialog.c b/gtk/gtkprintunixdialog.c
index dab4548b49..38f35a0b87 100644
--- a/gtk/gtkprintunixdialog.c
+++ b/gtk/gtkprintunixdialog.c
@@ -3009,6 +3009,8 @@ paper_size_changed (GtkDropDown *combo_box,
           gtk_window_present (GTK_WINDOW (custom_paper_dialog));
           G_GNUC_END_IGNORE_DEPRECATIONS
 
+          g_object_unref (page_setup);
+
           return;
         }
 
diff --git a/testsuite/gtk/filter.c b/testsuite/gtk/filter.c
index 5c5fd707c7..2e88a21f7a 100644
--- a/testsuite/gtk/filter.c
+++ b/testsuite/gtk/filter.c
@@ -28,8 +28,11 @@ get (GListModel *model,
      guint       position)
 {
   GObject *object = g_list_model_get_item (model, position);
+  guint ret;
   g_assert (object != NULL);
-  return GPOINTER_TO_UINT (g_object_get_qdata (object, number_quark));
+  ret = GPOINTER_TO_UINT (g_object_get_qdata (object, number_quark));
+  g_object_unref (object);
+  return ret;
 }
 
 static char *
diff --git a/testsuite/gtk/filterlistmodel-exhaustive.c b/testsuite/gtk/filterlistmodel-exhaustive.c
index 00be63ba08..ec1cbecc32 100644
--- a/testsuite/gtk/filterlistmodel-exhaustive.c
+++ b/testsuite/gtk/filterlistmodel-exhaustive.c
@@ -38,6 +38,8 @@
          g_assertion_message (G_LOG_DOMAIN, __FILE__, __LINE__, G_STRFUNC, _s); \
           g_free (_s); \
         } \
+      g_object_unref (o1); \
+      g_object_unref (o2); \
     } \
 }G_STMT_END
 
diff --git a/testsuite/gtk/multiselection.c b/testsuite/gtk/multiselection.c
index 970a6c4a6a..7d67f3ca3d 100644
--- a/testsuite/gtk/multiselection.c
+++ b/testsuite/gtk/multiselection.c
@@ -29,8 +29,11 @@ get (GListModel *model,
      guint       position)
 {
   GObject *object = g_list_model_get_item (model, position);
+  guint ret;
   g_assert (object != NULL);
-  return GPOINTER_TO_UINT (g_object_get_qdata (object, number_quark));
+  ret = GPOINTER_TO_UINT (g_object_get_qdata (object, number_quark));
+  g_object_unref (object);
+  return ret;
 }
 
 static char *
diff --git a/testsuite/gtk/treesorter.c b/testsuite/gtk/treesorter.c
index 6d1e314d30..59a32b5e25 100644
--- a/testsuite/gtk/treesorter.c
+++ b/testsuite/gtk/treesorter.c
@@ -69,6 +69,7 @@ model_to_string (GListModel *model)
       if (i > 0)
         g_string_append (string, " ");
       g_string_append_printf (string, "%u", get_with_parents (object));
+      /* no unref since get_with_parents consumes the ref */
     }
 
   return g_string_free (string, FALSE);