diff --git a/include/wx/valnum.h b/include/wx/valnum.h
index 428fe7ff8a..5971e612a6 100644
--- a/include/wx/valnum.h
+++ b/include/wx/valnum.h
@@ -135,11 +135,17 @@ public:
 
     typedef typename BaseValidator::LongestValueType LongestValueType;
 
+    // FIXME-VC6: This compiler fails to compile the assert below with a
+    // nonsensical error C2248: "'LongestValueType' : cannot access protected
+    // typedef declared in class 'wxIntegerValidatorBase'" so just disable the
+    // check for it.
+#ifndef __VISUALC6__
     wxCOMPILE_TIME_ASSERT
     (
         sizeof(ValueType) <= sizeof(LongestValueType),
         UnsupportedType
     );
+#endif // __VISUALC6__
 
     void SetMin(ValueType min)
     {