diff --git a/src/msw/stackwalk.cpp b/src/msw/stackwalk.cpp
index e8009e76f6..f67b384083 100644
--- a/src/msw/stackwalk.cpp
+++ b/src/msw/stackwalk.cpp
@@ -369,7 +369,7 @@ wxStackFrame::GetParam(size_t WXUNUSED(n),
     return false;
 }
 
-void wxStackFrame::OnParam(PSYMBOL_INFO WXUNUSED(pSymInfo))
+void wxStackFrame::OnParam(_SYMBOL_INFO * WXUNUSED(pSymInfo))
 {
 }