diff --git a/src/msw/ole/automtn.cpp b/src/msw/ole/automtn.cpp
index 3ca89f3231..ed03f00d7f 100644
--- a/src/msw/ole/automtn.cpp
+++ b/src/msw/ole/automtn.cpp
@@ -886,6 +886,7 @@ 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;