diff --git a/src/generic/prop.cpp b/src/generic/prop.cpp
index 30c510e874..44827dcf22 100644
--- a/src/generic/prop.cpp
+++ b/src/generic/prop.cpp
@@ -371,7 +371,7 @@ void wxPropertyValue::Copy(wxPropertyValue& copyFrom)
     case wxPropertyValueStringPtr:
     {
       wxChar** s = copyFrom.StringValuePtr();
-      (*this) = s;
+      (*this) = s != 0;
       return ;
     }