diff --git a/metainfo.xml b/metainfo.xml
index 0b9925b8e0..6f7edcf501 100644
--- a/metainfo.xml
+++ b/metainfo.xml
@@ -107,6 +107,7 @@
     <release version="0.4.2" urgency="medium" type="development">
       <description>
         <ul>
+          <li>Fixes Windows alt/control key modifiers (#1408).</li>
           <li>Fixes Windows built accidentally not including builtin-SSH support (#1427).</li>
           <li>Fixes some text run segmentation problems, e.g., not making use of some programming ligatures (#395).</li>
           <li>Fixes mouse scroll wheel events going into the wrong direction if `Alt` modifier was pressed at the same time (#394).</li>
diff --git a/src/crispy/flags.h b/src/crispy/flags.h
index 5e7ca29137..bbe294f79d 100644
--- a/src/crispy/flags.h
+++ b/src/crispy/flags.h
@@ -52,9 +52,11 @@ class flags
         _value &= ~static_cast<value_type>(flags._value);
     }
 
+    // Tests for existence of all given flags to be present.
+    // @return true if all flags are set in this flags set, false otherwise.
     [[nodiscard]] constexpr bool contains(flags<flag_type> flags) const noexcept
     {
-        return _value & flags.value();
+        return (_value & flags.value()) == flags.value();
     }
 
     [[nodiscard]] constexpr bool test(flag_type flag) const noexcept { return contains(flag); }