diff --git a/src/CLI.cpp b/src/CLI.cpp
index 8bfeeb6b..ca9fde09 100644
--- a/src/CLI.cpp
+++ b/src/CLI.cpp
@@ -28,6 +28,11 @@
 #include <CLI.h>
 #include <shared.h>
 
+////////////////////////////////////////////////////////////////////////////////
+A2::A2 (const std::string& raw, Lexer::Type lextype)
+{
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 void CLI::entity (const std::string& category, const std::string& name)
 {
diff --git a/src/CLI.h b/src/CLI.h
index 5ea45aff..16f915ec 100644
--- a/src/CLI.h
+++ b/src/CLI.h
@@ -27,10 +27,18 @@
 #ifndef INCLUDED_CLI
 #define INCLUDED_CLI
 
+#include <Lexer.h>
 #include <string>
 #include <vector>
 #include <map>
 
+// Represents a single argument.
+class A2
+{
+public:
+  A2 (const std::string&, Lexer::Type);
+};
+
 // Represents the command line.
 class CLI
 {