diff --git a/samples/console/console.cpp b/samples/console/console.cpp
index b996573935..5165ec811f 100644
--- a/samples/console/console.cpp
+++ b/samples/console/console.cpp
@@ -520,8 +520,8 @@ static void TestDllListLoaded()
         const wxDynamicLibraryDetails& details = dlls[n];
         printf("%-45s", (const char *)details.GetPath().mb_str());
 
-        void *addr;
-        size_t len;
+        void *addr wxDUMMY_INITIALIZE(NULL);
+        size_t len wxDUMMY_INITIALIZE(0);
         if ( details.GetAddress(&addr, &len) )
         {
             printf(" %08lx:%08lx",
diff --git a/samples/scroll/scroll.cpp b/samples/scroll/scroll.cpp
index f9adc6f43f..e30c5348d3 100644
--- a/samples/scroll/scroll.cpp
+++ b/samples/scroll/scroll.cpp
@@ -1240,7 +1240,7 @@ void MyAutoScrollingWindow::OnDraw(wxDC& dc)
     dc.SetPen(*wxTRANSPARENT_PEN);
     const wxString str = sm_testData;
     size_t strLength = str.length();
-    wxString::const_iterator str_i;
+    wxString::const_iterator str_i = std.begin();
 
     // draw the characters
     // 1. for each update region