diff --git a/src/com/xilinx/rapidwright/util/Utils.java b/src/com/xilinx/rapidwright/util/Utils.java
index 0597aa1e6..6d3b5fa4e 100644
--- a/src/com/xilinx/rapidwright/util/Utils.java
+++ b/src/com/xilinx/rapidwright/util/Utils.java
@@ -384,6 +384,9 @@ public static boolean isIOB(SiteTypeEnum s) {
             SiteTypeEnum.IOB,
             SiteTypeEnum.IOBM,
             SiteTypeEnum.IOBS,
+            SiteTypeEnum.HDIOB,
+            SiteTypeEnum.HDIOB_M,
+            SiteTypeEnum.HDIOB_S,
             SiteTypeEnum.HPIOB,
             SiteTypeEnum.HPIOB_M,
             SiteTypeEnum.HPIOB_S,