diff --git a/src/gtk/dialog.cpp b/src/gtk/dialog.cpp
index 067aa65fac..2e1f606c43 100644
--- a/src/gtk/dialog.cpp
+++ b/src/gtk/dialog.cpp
@@ -261,7 +261,7 @@ void wxDialog::OnSize( wxSizeEvent &WXUNUSED(event) )
         for(wxNode *node = GetChildren().First(); node; node = node->Next())
         {
             wxWindow *win = (wxWindow *)node->Data();
-            if (!IS_KIND_OF(win,wxFrame) && !IS_KIND_OF(win,wxDialog))
+            if (!wxIS_KIND_OF(win,wxFrame) && !wxIS_KIND_OF(win,wxDialog))
             {
 	        // it's the second one: do nothing
                 if (child) return;
diff --git a/src/gtk/frame.cpp b/src/gtk/frame.cpp
index 4e9104c7a9..8d0d64c9ca 100644
--- a/src/gtk/frame.cpp
+++ b/src/gtk/frame.cpp
@@ -462,7 +462,7 @@ void wxFrame::OnSize( wxSizeEvent &WXUNUSED(event) )
         for(wxNode *node = GetChildren().First(); node; node = node->Next())
         {
             wxWindow *win = (wxWindow *)node->Data();
-            if (!IS_KIND_OF(win,wxFrame) && !IS_KIND_OF(win,wxDialog)
+            if (!wxIS_KIND_OF(win,wxFrame) && !wxIS_KIND_OF(win,wxDialog)
 #if 0  // not in m_children anyway ?
               && (win != m_frameMenuBar) &&
               (win != m_frameToolBar) &&
diff --git a/src/gtk1/dialog.cpp b/src/gtk1/dialog.cpp
index 067aa65fac..2e1f606c43 100644
--- a/src/gtk1/dialog.cpp
+++ b/src/gtk1/dialog.cpp
@@ -261,7 +261,7 @@ void wxDialog::OnSize( wxSizeEvent &WXUNUSED(event) )
         for(wxNode *node = GetChildren().First(); node; node = node->Next())
         {
             wxWindow *win = (wxWindow *)node->Data();
-            if (!IS_KIND_OF(win,wxFrame) && !IS_KIND_OF(win,wxDialog))
+            if (!wxIS_KIND_OF(win,wxFrame) && !wxIS_KIND_OF(win,wxDialog))
             {
 	        // it's the second one: do nothing
                 if (child) return;
diff --git a/src/gtk1/frame.cpp b/src/gtk1/frame.cpp
index 4e9104c7a9..8d0d64c9ca 100644
--- a/src/gtk1/frame.cpp
+++ b/src/gtk1/frame.cpp
@@ -462,7 +462,7 @@ void wxFrame::OnSize( wxSizeEvent &WXUNUSED(event) )
         for(wxNode *node = GetChildren().First(); node; node = node->Next())
         {
             wxWindow *win = (wxWindow *)node->Data();
-            if (!IS_KIND_OF(win,wxFrame) && !IS_KIND_OF(win,wxDialog)
+            if (!wxIS_KIND_OF(win,wxFrame) && !wxIS_KIND_OF(win,wxDialog)
 #if 0  // not in m_children anyway ?
               && (win != m_frameMenuBar) &&
               (win != m_frameToolBar) &&