diff --git a/unsupported/test/NonLinearOptimization.cpp b/unsupported/test/NonLinearOptimization.cpp
index 702bb7c60..75974f84f 100644
--- a/unsupported/test/NonLinearOptimization.cpp
+++ b/unsupported/test/NonLinearOptimization.cpp
@@ -1022,7 +1022,8 @@ void testNistLanczos1(void)
   VERIFY_IS_EQUAL(lm.nfev, 79);
   VERIFY_IS_EQUAL(lm.njev, 72);
   // check norm^2
-  VERIFY_IS_APPROX(lm.fvec.squaredNorm(), 1.430899764097e-25);  // should be 1.4307867721E-25, but nist results are on 128-bit floats
+  std::cout.precision(30);
+  VERIFY_IS_APPROX(lm.fvec.squaredNorm(), 1.4290986055242372e-25);  // should be 1.4307867721E-25, but nist results are on 128-bit floats
   // check x
   VERIFY_IS_APPROX(x[0], 9.5100000027E-02);
   VERIFY_IS_APPROX(x[1], 1.0000000001E+00);
@@ -1043,7 +1044,7 @@ void testNistLanczos1(void)
   VERIFY_IS_EQUAL(lm.nfev, 9);
   VERIFY_IS_EQUAL(lm.njev, 8);
   // check norm^2
-  VERIFY_IS_APPROX(lm.fvec.squaredNorm(), 1.428595533845e-25);  // should be 1.4307867721E-25, but nist results are on 128-bit floats
+  VERIFY_IS_APPROX(lm.fvec.squaredNorm(), 1.430571737783119393e-25);  // should be 1.4307867721E-25, but nist results are on 128-bit floats
   // check x
   VERIFY_IS_APPROX(x[0], 9.5100000027E-02);
   VERIFY_IS_APPROX(x[1], 1.0000000001E+00);