diff --git a/src/constraint_solver/expr_array.cc b/src/constraint_solver/expr_array.cc
index 382dda69ea..5252734910 100644
--- a/src/constraint_solver/expr_array.cc
+++ b/src/constraint_solver/expr_array.cc
@@ -2565,14 +2565,6 @@ class ExprLinearizer : public ModelParser {
 };
 #undef IS_TYPE
 
-string Show(const std::vector<int64>& v) {
-  return Int64VectorToString(v, " ");
-}
-
-string Show(const std::vector<int>& v) {
-  return IntVectorToString(v, " ");
-}
-
 // ----- Factory functions -----
 
 template<class T> Constraint* MakeScalProdEqualityFct(