diff --git a/README.md b/README.md
index 7856417..c020eaa 100644
--- a/README.md
+++ b/README.md
@@ -27,7 +27,7 @@ Epigraph is a modern C++ interface to formulate and solve linear, quadratic and
 
 ## Dependencies
 
-* [Eigen](http://eigen.tuxfamily.org) 3.3.7
+* [Eigen](http://eigen.tuxfamily.org)
 
 ## Supported Solvers
 
diff --git a/include/parameter.hpp b/include/parameter.hpp
index 26b52dc..c2b384d 100644
--- a/include/parameter.hpp
+++ b/include/parameter.hpp
@@ -87,6 +87,9 @@ namespace cvx
 
             bool operator==(const Parameter &other) const;
 
+            // required for eigen < 3.3.7
+            bool operator==(const int const_value) const;
+
             Parameter operator+(const Parameter &other) const;
             Parameter operator-(const Parameter &other) const;
             Parameter operator-() const;
diff --git a/src/parameter.cpp b/src/parameter.cpp
index d3c6ce8..c468bd4 100644
--- a/src/parameter.cpp
+++ b/src/parameter.cpp
@@ -147,6 +147,11 @@ namespace cvx::internal
         return compare_sources(this->source, other.source);
     }
 
+    bool Parameter::operator==(const int const_value) const
+    {
+        return compare_sources(this->source, Parameter(const_value).source);
+    }
+
     Parameter::operator double() const
     {
         return getValue();