diff --git a/icu4c/source/common/propname.cpp b/icu4c/source/common/propname.cpp
index dbd19dd8e68..3f26e18bf8a 100644
--- a/icu4c/source/common/propname.cpp
+++ b/icu4c/source/common/propname.cpp
@@ -196,7 +196,7 @@ U_CAPI int32_t U_EXPORT2
 u_getPropertyValueEnum(UProperty property,
                        const char* alias) {
     return load() ? PNAME->getPropertyValueEnum(property, alias)
-                  : UCHAR_INVALID_CODE;
+                  : (int32_t)UCHAR_INVALID_CODE;
 }
 
 /* data swapping ------------------------------------------------------------ */
diff --git a/icu4c/source/common/uiter.cpp b/icu4c/source/common/uiter.cpp
index 626b425844b..7728cd21a99 100644
--- a/icu4c/source/common/uiter.cpp
+++ b/icu4c/source/common/uiter.cpp
@@ -762,7 +762,7 @@ utf8IteratorMove(UCharIterator *iter, int32_t delta, UCharIteratorOrigin origin)
             iter->index=iter->length; /* may or may not be <0 (unknown) */
             iter->start=iter->limit;
             iter->reservedField=0;
-            return iter->index>=0 ? iter->index : UITER_UNKNOWN_INDEX;
+            return iter->index>=0 ? iter->index : (int32_t)UITER_UNKNOWN_INDEX;
         }
     }