diff --git a/src/macro/Expressions.cc b/src/macro/Expressions.cc
index 1f86367ddc9dc815fd5687c5cea783f0200dd835..a8a2a6a21057a375326996cec9ec9fc1e72a2db1 100644
--- a/src/macro/Expressions.cc
+++ b/src/macro/Expressions.cc
@@ -1268,7 +1268,6 @@ BinaryOp::to_string() const noexcept
 string
 TrinaryOp::to_string() const noexcept
 {
-  string retval = arg1->to_string();
   switch(op_code)
     {
     case codes::TrinaryOp::normpdf: