diff --git a/tests/controls/comboboxtest.cpp b/tests/controls/comboboxtest.cpp
index 3c52fb9a17..96e349b4ed 100644
--- a/tests/controls/comboboxtest.cpp
+++ b/tests/controls/comboboxtest.cpp
@@ -155,6 +155,7 @@ void ComboBoxTestCase::PopDismiss()
 void ComboBoxTestCase::Sort()
 {
 #if !defined(__WXOSX__)
+    delete m_combo;
     m_combo = new wxComboBox(wxTheApp->GetTopWindow(), wxID_ANY, "",
                              wxDefaultPosition, wxDefaultSize, 0, NULL,
                              wxCB_SORT);
@@ -185,6 +186,7 @@ void ComboBoxTestCase::ReadOnly()
     testitems.Add("item 1");
     testitems.Add("item 2");
 
+    delete m_combo;
     m_combo = new wxComboBox(wxTheApp->GetTopWindow(), wxID_ANY, "",
                              wxDefaultPosition, wxDefaultSize, testitems,
                              wxCB_READONLY);
diff --git a/tests/controls/ownerdrawncomboboxtest.cpp b/tests/controls/ownerdrawncomboboxtest.cpp
index 89e02664a3..ca18d25da3 100644
--- a/tests/controls/ownerdrawncomboboxtest.cpp
+++ b/tests/controls/ownerdrawncomboboxtest.cpp
@@ -140,6 +140,7 @@ void OwnerDrawnComboBoxTestCase::PopDismiss()
 
 void OwnerDrawnComboBoxTestCase::Sort()
 {
+    delete m_combo;
     m_combo = new wxOwnerDrawnComboBox(wxTheApp->GetTopWindow(),
                                        wxID_ANY, "",
                                        wxDefaultPosition, wxDefaultSize,
@@ -171,6 +172,7 @@ void OwnerDrawnComboBoxTestCase::ReadOnly()
     testitems.Add("item 1");
     testitems.Add("item 2");
 
+    delete m_combo;
     m_combo = new wxOwnerDrawnComboBox(wxTheApp->GetTopWindow(), wxID_ANY, "",
                                        wxDefaultPosition, wxDefaultSize,
                                        testitems,