diff --git a/src/libs/qmuparser/qmutranslation.cpp b/src/libs/qmuparser/qmutranslation.cpp
index 87b9c7f53..cb6ab05ba 100644
--- a/src/libs/qmuparser/qmutranslation.cpp
+++ b/src/libs/qmuparser/qmutranslation.cpp
@@ -25,6 +25,11 @@
 #include <QCoreApplication>
 #include <QLocale>
 
+// Header <ciso646> is removed in C++20.
+#if __cplusplus <= 201703L
+#include <ciso646> // and, not, or
+#endif
+
 namespace qmu
 {