diff --git a/dlls/oledb32/tests/convert.c b/dlls/oledb32/tests/convert.c
index b45775f7b24..1d55e7fcb47 100644
--- a/dlls/oledb32/tests/convert.c
+++ b/dlls/oledb32/tests/convert.c
@@ -2645,7 +2645,7 @@ static void test_converttor8(void)
 
     dst_len = 44;
     V_VT(&var) = VT_NULL;
-    hr = IDataConvert_DataConvert(convert, DBTYPE_VARIANT, DBTYPE_R4, 0, &dst_len, &var, &dst, sizeof(dst), 0, &dst_status, 0, 0, 0);
+    hr = IDataConvert_DataConvert(convert, DBTYPE_VARIANT, DBTYPE_R8, 0, &dst_len, &var, &dst, sizeof(dst), 0, &dst_status, 0, 0, 0);
     ok(hr == S_OK, "got %08x\n", hr);
     ok(dst_status == DBSTATUS_S_ISNULL, "got %08x\n", dst_status);
     ok(dst_len == 44, "got %ld\n", dst_len);