diff --git a/icu4c/source/common/uniset_props.cpp b/icu4c/source/common/uniset_props.cpp
index 590c5a84b13..2e619904f72 100644
--- a/icu4c/source/common/uniset_props.cpp
+++ b/icu4c/source/common/uniset_props.cpp
@@ -1286,7 +1286,8 @@ const UnicodeSet* UnicodeSet::getInclusions(int32_t src, UErrorCode &status) {
             (USet *)incl,
             _set_add,
             _set_addRange,
-            _set_addString
+            _set_addString,
+            NULL // don't need remove()
         };
 
         if (incl != NULL) {
@@ -1369,7 +1370,8 @@ UnicodeSet& UnicodeSet::closeOver(int32_t attribute) {
                 (USet *)&foldSet,
                 _set_add,
                 _set_addRange,
-                _set_addString
+                _set_addString,
+                NULL // don't need remove()
             };
 
             // start with input set to guarantee inclusion
diff --git a/icu4c/source/i18n/name2uni.cpp b/icu4c/source/i18n/name2uni.cpp
index e42c593b235..4690b666162 100644
--- a/icu4c/source/i18n/name2uni.cpp
+++ b/icu4c/source/i18n/name2uni.cpp
@@ -63,7 +63,8 @@ NameUnicodeTransliterator::NameUnicodeTransliterator(UnicodeFilter* adoptedFilte
         (USet *)&legal, // USet* == UnicodeSet*
         _set_add,
         _set_addRange,
-        _set_addString
+        _set_addString,
+        NULL // don't need remove()
     };
     uprv_getCharNameCharacters(&sa);
 }
diff --git a/icu4c/source/test/cintltst/cucdtst.c b/icu4c/source/test/cintltst/cucdtst.c
index f01bd0b8925..d17e5381202 100644
--- a/icu4c/source/test/cintltst/cucdtst.c
+++ b/icu4c/source/test/cintltst/cucdtst.c
@@ -1680,7 +1680,8 @@ TestCharNames() {
                 NULL,
                 uset_add,
                 uset_addRange,
-                uset_addString
+                uset_addString,
+                NULL // don't need remove()
             };
             sa.set=set;
             uprv_getCharNameCharacters(&sa);
diff --git a/icu4c/source/test/intltest/tstnorm.cpp b/icu4c/source/test/intltest/tstnorm.cpp
index 258e79a1782..65373814ef0 100644
--- a/icu4c/source/test/intltest/tstnorm.cpp
+++ b/icu4c/source/test/intltest/tstnorm.cpp
@@ -1713,7 +1713,8 @@ BasicNormalizerTest::TestSkippable() {
         (USet *)&starts,
         _set_add,
         _set_addRange,
-        _set_addString
+        _set_addString,
+        NULL // don't need remove()
     };
     unorm_addPropertyStarts(&sa, &status);
     if(U_FAILURE(status)) {