diff --git a/include/cxxopts.hpp b/include/cxxopts.hpp
index 63d6336..71a2afb 100644
--- a/include/cxxopts.hpp
+++ b/include/cxxopts.hpp
@@ -309,6 +309,9 @@ namespace cxxopts
     virtual std::shared_ptr<Value>
     implicit_value(const std::string& value) = 0;
 
+    virtual std::shared_ptr<Value>
+    no_implicit_value() = 0;
+
     virtual bool
     is_boolean() const = 0;
   };
@@ -825,6 +828,13 @@ namespace cxxopts
         return shared_from_this();
       }
 
+      std::shared_ptr<Value>
+      no_implicit_value()
+      {
+        m_implicit = false;
+        return shared_from_this();
+      }
+
       std::string
       get_default_value() const
       {