diff --git a/include/wx/math.h b/include/wx/math.h
index f1f4d889f7..12443b630c 100644
--- a/include/wx/math.h
+++ b/include/wx/math.h
@@ -107,6 +107,9 @@
 
     inline int wxRound(double x)
     {
+        wxASSERT_MSG( x > INT_MIN - 0.5 && x < INT_MAX + 0.5,
+                      _T("argument out of supported range") );
+
         #if defined(HAVE_ROUND)
             return int(round(x));
         #else