diff --git a/src/analysis/TaylorPolynomial.hpp b/src/analysis/TaylorPolynomial.hpp
index d3f03154f1f621328ba3821ce6bb7d23794b5a75..1406a5989a4393e90933f4e59ff232f793311082 100644
--- a/src/analysis/TaylorPolynomial.hpp
+++ b/src/analysis/TaylorPolynomial.hpp
@@ -507,7 +507,7 @@ class TaylorPolynomial
               os << "(y - " << P.x0()[1] << ")"
                  << "^" << j;
             } else {
-              os << "y";
+              os << "(y - " << P.x0()[1] << ")";
             }
           } else if (j == 0) {
             if (i == 1) {