diff --git a/icu4c/source/common/ucnvhz.c b/icu4c/source/common/ucnvhz.c
index 5781337f8a4..35cbd2dcb23 100644
--- a/icu4c/source/common/ucnvhz.c
+++ b/icu4c/source/common/ucnvhz.c
@@ -598,7 +598,10 @@ _HZ_WriteSub(UConverterFromUnicodeArgs *args, int32_t offsetIndex, UErrorCode *e
 /* structure for SafeClone calculations */
 struct cloneStruct
 {
-    UConverter cnv, subCnv;
+    UConverter cnv;
+    UAlignedMemory deadSpace1;
+    UConverter subCnv;
+    UAlignedMemory deadSpace2;
     UConverterDataHZ mydata;
 };