diff --git a/libs/ezsat/ezsat.cc b/libs/ezsat/ezsat.cc
index bbebee74f..fb3d24996 100644
--- a/libs/ezsat/ezsat.cc
+++ b/libs/ezsat/ezsat.cc
@@ -67,6 +67,20 @@ int ezSAT::literal(const std::string &name)
 	return literalsCache.at(name);
 }
 
+int ezSAT::frozen_literal()
+{
+	int id = literal();
+	freeze(id);
+	return id;
+}
+
+int ezSAT::frozen_literal(const std::string &name)
+{
+	int id = literal(name);
+	freeze(id);
+	return id;
+}
+
 int ezSAT::expression(OpId op, int a, int b, int c, int d, int e, int f)
 {
 	std::vector<int> args(6);
diff --git a/libs/ezsat/ezsat.h b/libs/ezsat/ezsat.h
index 13b39d4ef..b0b731d0a 100644
--- a/libs/ezsat/ezsat.h
+++ b/libs/ezsat/ezsat.h
@@ -79,6 +79,8 @@ public:
 	int value(bool val);
 	int literal();
 	int literal(const std::string &name);
+	int frozen_literal();
+	int frozen_literal(const std::string &name);
 	int expression(OpId op, int a = 0, int b = 0, int c = 0, int d = 0, int e = 0, int f = 0);
 	int expression(OpId op, const std::vector<int> &args);