diff --git a/src/Evalvisitor.cpp b/src/Evalvisitor.cpp
index 2cb96e7..d342d5f 100644
--- a/src/Evalvisitor.cpp
+++ b/src/Evalvisitor.cpp
@@ -364,6 +364,7 @@ std::any EvalVisitor::visitFactor(Python3Parser::FactorContext *ctx) {
   if (ctx->atom_expr()) return visitAtom_expr(ctx->atom_expr());
   std::any res = visitFactor(ctx->factor());
   res = DeQuate(res, Variables);
+  if (ctx->MINUS()) res = Neg(res);
   return res;
 }