diff --git a/data/schema/language.xsd b/data/schema/language.xsd
--- a/data/schema/language.xsd
+++ b/data/schema/language.xsd
@@ -311,16 +311,16 @@
       lineEndContext:   Next context if end of line is encountered
       lineEmptyContext: Next context if an empty line is encountered [optional]
       fallthrough:      Use a fallthrough context [optional]
+                deprecated since 5.62 but preserved to maintain compatibility in older versions of KF5
       fallthroughContext: Fall through to this context [optional]
       dynamic:          Dynamic context [boolean, optional]
       noIndentationBasedFolding: Python uses indentation based folding. However, Python has parts where
     		    it does not use indentation based folding (e.g. for """ strings). In this case
     		    switch to an own context and set this attribute to true. Then the indentation
     		    based folding will ignore this parts and not change folding markers. [optional]

     TODO:
       - Explain fallthrough.
-      - Do we need fallthrough at all? It could be true, if fallthroughContext is set, false otherwise.
       - Make lineEndContext optional, defaults to '#stay'. Reasonable?
   -->
   <xs:element name="context">
@@ -350,7 +350,15 @@
       <xs:attribute name="attribute" use="required"/>
       <xs:attribute name="lineEndContext" use="required"/>
       <xs:attribute name="lineEmptyContext"/>
-      <xs:attribute name="fallthrough" type="xs:boolean"/>
+      <xs:attribute name="fallthrough">
+        <xs:simpleType>
+          <!-- alway true since 5.62 -->
+          <xs:restriction base="xs:token">
+            <xs:enumeration value="1"/>
+            <xs:enumeration value="true"/>
+          </xs:restriction>
+        </xs:simpleType>
+      </xs:attribute>
       <xs:attribute name="fallthroughContext"/>
       <xs:attribute name="dynamic" type="xs:boolean"/>
       <xs:attribute name="noIndentationBasedFolding" type="xs:boolean"/>
diff --git a/src/lib/context.cpp b/src/lib/context.cpp
--- a/src/lib/context.cpp
+++ b/src/lib/context.cpp
@@ -61,12 +61,10 @@
     m_attribute = reader.attributes().value(QStringLiteral("attribute")).toString();
     m_lineEndContext.parse(reader.attributes().value(QStringLiteral("lineEndContext")));
     m_lineEmptyContext.parse(reader.attributes().value(QStringLiteral("lineEmptyContext")));
-    m_fallthrough = Xml::attrToBool(reader.attributes().value(QStringLiteral("fallthrough")));
     m_fallthroughContext.parse(reader.attributes().value(QStringLiteral("fallthroughContext")));
-    if (m_fallthroughContext.isStay())
-        m_fallthrough = false;
+    m_fallthrough = !m_fallthroughContext.isStay();
     m_noIndentationBasedFolding = Xml::attrToBool(reader.attributes().value(QStringLiteral("noIndentationBasedFolding")));

     reader.readNext();
     while (!reader.atEnd()) {
         switch (reader.tokenType()) {