diff --git a/lldb/include/lldb/Expression/Expression.h b/lldb/include/lldb/Expression/Expression.h
index 1e4453de04ff..aaac889e6ed2 100644
--- a/lldb/include/lldb/Expression/Expression.h
+++ b/lldb/include/lldb/Expression/Expression.h
@@ -51,7 +51,9 @@ public:
 
   /// Return the language that should be used when parsing.  To use the
   /// default, return eLanguageTypeUnknown.
-  virtual lldb::LanguageType Language() { return lldb::eLanguageTypeUnknown; }
+  virtual lldb::LanguageType Language() const {
+    return lldb::eLanguageTypeUnknown;
+  }
 
   /// Return the Materializer that the parser should use when registering
   /// external values.
diff --git a/lldb/include/lldb/Expression/UserExpression.h b/lldb/include/lldb/Expression/UserExpression.h
index 8f3a505addea..8236c417f73a 100644
--- a/lldb/include/lldb/Expression/UserExpression.h
+++ b/lldb/include/lldb/Expression/UserExpression.h
@@ -194,7 +194,7 @@ public:
 
   /// Return the language that should be used when parsing.  To use the
   /// default, return eLanguageTypeUnknown.
-  lldb::LanguageType Language() override { return m_language; }
+  lldb::LanguageType Language() const override { return m_language; }
 
   /// Return the desired result type of the function, or eResultTypeAny if
   /// indifferent.