diff --git a/src/gtk1/choice.cpp b/src/gtk1/choice.cpp
index 80300657bb..e1c2a36b50 100644
--- a/src/gtk1/choice.cpp
+++ b/src/gtk1/choice.cpp
@@ -133,7 +133,7 @@ bool wxChoice::Create( wxWindow *parent, wxWindowID id,
 
     GtkWidget *menu = gtk_menu_new();
 
-    for (unsigned int i = 0; i < n; i++)
+    for (unsigned int i = 0; i < (unsigned int)n; i++)
     {
         GtkAddHelper(menu, i, choices[i]);
     }
diff --git a/src/gtk1/listbox.cpp b/src/gtk1/listbox.cpp
index 260122e33c..ebfe1b76cb 100644
--- a/src/gtk1/listbox.cpp
+++ b/src/gtk1/listbox.cpp
@@ -589,7 +589,7 @@ void wxListBox::DoInsertItems(const wxArrayString& items, unsigned int pos)
     InvalidateBestSize();
 
     GList *children = m_list->children;
-    int length = g_list_length(children);
+    unsigned int length = g_list_length(children);
 
     wxCHECK_RET( pos <= length, wxT("invalid index in wxListBox::InsertItems") );