diff --git a/src/Expr.cc b/src/Expr.cc
index 5c68acd65a..fb91b0b108 100644
--- a/src/Expr.cc
+++ b/src/Expr.cc
@@ -2738,7 +2738,7 @@ HasFieldExpr::HasFieldExpr(ExprPtr arg_op, const char* arg_field_name)
     }
 }
 
-HasFieldExpr::~HasFieldExpr() { delete field_name; }
+HasFieldExpr::~HasFieldExpr() { delete[] field_name; }
 
 ValPtr HasFieldExpr::Fold(Val* v) const {
     auto rv = v->AsRecordVal();