diff --git a/internal/ceres/line_search_direction.cc b/internal/ceres/line_search_direction.cc
index 2f27a78..1fc4de5 100644
--- a/internal/ceres/line_search_direction.cc
+++ b/internal/ceres/line_search_direction.cc
@@ -81,7 +81,7 @@
 
     *search_direction =  -current.gradient + beta * previous.search_direction;
     const double directional_derivative =
-        current. gradient.dot(*search_direction);
+        current.gradient.dot(*search_direction);
     if (directional_derivative > -function_tolerance_) {
       LOG(WARNING) << "Restarting non-linear conjugate gradients: "
                    << directional_derivative;