diff --git a/src/plugins/streamers/lstream/lstream.pri b/src/plugins/streamers/lstream/lstream.pri
index b4a0709e1..05b84310e 100644
--- a/src/plugins/streamers/lstream/lstream.pri
+++ b/src/plugins/streamers/lstream/lstream.pri
@@ -1,11 +1,12 @@
 
-# capnp needs C++ 14 in version 1.0.1
-# Qt6 comes with C++ 17 requirement.
-equals(HAVE_QT, "0") || lessThan(QT_MAJOR_VERSION, 6) {
-  QMAKE_CXXFLAGS += -std=c++14
-}
-
 !msvc {
+
+  # capnp needs C++ 14 in version 1.0.1
+  # Qt6 comes with C++ 17 requirement.
+  equals(HAVE_QT, "0") || lessThan(QT_MAJOR_VERSION, 6) {
+    QMAKE_CXXFLAGS += -std=c++14
+  }
+
   # capnp runtimes have some unused arguments
   QMAKE_CXXFLAGS += \
       -Wno-unused-parameter