diff --git a/src/preface.h b/src/preface.h
index 85e59830..a59d1348 100644
--- a/src/preface.h
+++ b/src/preface.h
@@ -122,6 +122,8 @@
 #pragma warning(disable : 6235) /* <expression> is always a constant */
 #pragma warning(disable : 6237) /* <expression> is never evaluated and might                                           \
                                    have side effects */
+#pragma warning(disable : 5286) /* implicit conversion from enum type 'type 1' to enum type 'type 2' */
+#pragma warning(disable : 5287) /* operands are different enum types 'type 1' and 'type 2' */
 #endif
 #pragma warning(disable : 4710) /* 'xyz': function not inlined */
 #pragma warning(disable : 4711) /* function 'xyz' selected for automatic                                               \