diff --git a/tests/auto/corelib/ipc/ipctestcommon.h b/tests/auto/corelib/ipc/ipctestcommon.h
index 2347031ad45..4ea9d4eeab6 100644
--- a/tests/auto/corelib/ipc/ipctestcommon.h
+++ b/tests/auto/corelib/ipc/ipctestcommon.h
@@ -5,6 +5,9 @@
 #include <QtTest/QTest>
 #include <QtCore/QNativeIpcKey>
 
+#include <cstdio>
+#include <memory>
+
 namespace IpcTestCommon {
 static QList<QNativeIpcKey::Type> supportedKeyTypes;
 
@@ -64,7 +67,7 @@ template<> inline char *toString(const QNativeIpcKey::Type &type)
         return qstrdup("Invalid");
 
     char buf[32];
-    qsnprintf(buf, sizeof(buf), "%u", unsigned(type));
+    std::snprintf(buf, sizeof(buf), "%u", qToUnderlying(type));
     return qstrdup(buf);
 }
 
@@ -73,12 +76,11 @@ template<> inline char *toString(const QNativeIpcKey &key)
     if (!key.isValid())
         return qstrdup("<invalid>");
 
-    const char *type = toString(key.type());
-    const char *text = toString(key.nativeKey());
+    using UP = std::unique_ptr<char[]>;
+    const auto type = UP{toString(key.type())};
+    const auto text = UP{toString(key.nativeKey())};
     char buf[256];
-    qsnprintf(buf, sizeof(buf), "QNativeIpcKey(%s, %s)", text, type);
-    delete[] type;
-    delete[] text;
+    std::snprintf(buf, sizeof(buf), "QNativeIpcKey(%s, %s)", text.get(), type.get());
     return qstrdup(buf);
 }
 } // namespace QTest