diff --git a/src/plugins/streamers/lstream/lstream.pri b/src/plugins/streamers/lstream/lstream.pri
index 05b84310e..a3a6b2991 100644
--- a/src/plugins/streamers/lstream/lstream.pri
+++ b/src/plugins/streamers/lstream/lstream.pri
@@ -4,6 +4,9 @@
   # capnp needs C++ 14 in version 1.0.1
   # Qt6 comes with C++ 17 requirement.
   equals(HAVE_QT, "0") || lessThan(QT_MAJOR_VERSION, 6) {
+    # (1) and (2) are required by (macOS Sonoma) x (Qt5 MacPorts)
+    CONFIG -= c++11 # (1)
+    CONFIG += c++14 # (2)
     QMAKE_CXXFLAGS += -std=c++14
   }