diff --git a/internal/ceres/trust_region_minimizer.cc b/internal/ceres/trust_region_minimizer.cc
index 76c4f8a..194d54e 100644
--- a/internal/ceres/trust_region_minimizer.cc
+++ b/internal/ceres/trust_region_minimizer.cc
@@ -77,7 +77,7 @@
                                          double* scale) const {
   jacobian.SquaredColumnNorm(scale);
   for (int i = 0; i < jacobian.num_cols(); ++i) {
-    scale[i] = 1.0 / (kEpsilon + sqrt(scale[i]));
+    scale[i] = 1.0 / (1.0 + sqrt(scale[i]));
   }
 }