diff --git a/src/msw/ole/automtn.cpp b/src/msw/ole/automtn.cpp
index 86de5628a5..75d954e5a0 100644
--- a/src/msw/ole/automtn.cpp
+++ b/src/msw/ole/automtn.cpp
@@ -862,6 +862,7 @@ static void ReleaseVariant(VARIANTARG *pvarg)
             case VT_R8:
             case VT_ERROR:        // to avoid erroring on an error return from Excel
             case VT_EMPTY:
+            case VT_DATE:
                 // no work for these types
                 break;