diff --git a/icu4c/source/test/fuzzer/relative_date_time_formatter_fuzzer.cpp b/icu4c/source/test/fuzzer/relative_date_time_formatter_fuzzer.cpp
index 007d350f2c9..afcf57d858d 100644
--- a/icu4c/source/test/fuzzer/relative_date_time_formatter_fuzzer.cpp
+++ b/icu4c/source/test/fuzzer/relative_date_time_formatter_fuzzer.cpp
@@ -4,6 +4,7 @@
 // Fuzzer for ICU RelativeDateTimeFormatter.
 
 #include <cstring>
+#include <memory>
 
 #include "fuzzer_utils.h"
 
@@ -48,8 +49,8 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
     context = validCapitalizations[
         static_cast<int>(context) %
             (sizeof(validCapitalizations) / sizeof(UDisplayContext))];
-    formatter.reset(new icu::RelativeDateTimeFormatter(
-        locale, nullptr, style, context, status));
+    formatter =
+        std::make_unique<icu::RelativeDateTimeFormatter>(locale, nullptr, style, context, status);
 
     if (U_SUCCESS(status)) {
         URelativeDateTimeUnit unit;
diff --git a/icu4c/source/tools/genrb/filterrb.cpp b/icu4c/source/tools/genrb/filterrb.cpp
index dcc02fc6210..d6480968742 100644
--- a/icu4c/source/tools/genrb/filterrb.cpp
+++ b/icu4c/source/tools/genrb/filterrb.cpp
@@ -2,6 +2,7 @@
 // License & terms of use: http://www.unicode.org/copyright.html
 
 #include <iostream>
+#include <memory>
 #include <stack>
 
 #include "filterrb.h"
@@ -150,7 +151,7 @@ SimpleRuleBasedPathFilter::Tree::Tree(const Tree& other)
         : fIncluded(other.fIncluded), fChildren(other.fChildren) {
     // Note: can't use the default copy assignment because of the std::unique_ptr
     if (other.fWildcard) {
-        fWildcard.reset(new Tree(*other.fWildcard));
+        fWildcard = std::make_unique<Tree>(*other.fWildcard);
     }
 }
 
@@ -181,7 +182,7 @@ void SimpleRuleBasedPathFilter::Tree::applyRule(
     if (key == "*") {
         // Case 1: Wildcard
         if (!fWildcard) {
-            fWildcard.reset(new Tree());
+            fWildcard = std::make_unique<Tree>();
         }
         // Apply the rule to fWildcard and also to all existing children.
         it++;