diff --git a/src/libs/qmuparser/qmudef.h b/src/libs/qmuparser/qmudef.h
index 39addb376..893ca3629 100644
--- a/src/libs/qmuparser/qmudef.h
+++ b/src/libs/qmuparser/qmudef.h
@@ -31,6 +31,9 @@
     #pragma GCC diagnostic ignored "-Wattributes"
 #endif
 
+#ifdef Q_CC_MSVC
+    #include <ciso646>
+#endif /* Q_CC_MSVC */
 //---------------------------------------------------------------------------------------------------------------------
 inline QString NameRegExp()
 {
diff --git a/src/test/ValentinaTest/tst_vcommandline.cpp b/src/test/ValentinaTest/tst_vcommandline.cpp
index 627462849..f429ba9ee 100644
--- a/src/test/ValentinaTest/tst_vcommandline.cpp
+++ b/src/test/ValentinaTest/tst_vcommandline.cpp
@@ -32,6 +32,9 @@
 
 #include <QtTest>
 
+#ifdef Q_CC_MSVC
+    #include <ciso646>
+#endif /* Q_CC_MSVC */
 //---------------------------------------------------------------------------------------------------------------------
 TST_VCommandLine::TST_VCommandLine(QObject *parent)
     :QObject(parent)