diff --git a/internal/ceres/event_logger.cc b/internal/ceres/event_logger.cc
index 917c167..31049a5 100644
--- a/internal/ceres/event_logger.cc
+++ b/internal/ceres/event_logger.cc
@@ -30,12 +30,13 @@
 
 #include "ceres/event_logger.h"
 
+#include <string>
+
 #include "absl/log/log.h"
 #include "absl/log/vlog_is_on.h"
 #include "absl/strings/str_format.h"
 #include "absl/time/clock.h"
 #include "absl/time/time.h"
-#include "ceres/internal/config.h"
 
 namespace ceres::internal {
 
diff --git a/internal/ceres/gradient_problem_solver.cc b/internal/ceres/gradient_problem_solver.cc
index 02038da..5458f26 100644
--- a/internal/ceres/gradient_problem_solver.cc
+++ b/internal/ceres/gradient_problem_solver.cc
@@ -38,6 +38,7 @@
 #include "absl/log/log.h"
 #include "absl/strings/str_cat.h"
 #include "absl/strings/str_format.h"
+#include "absl/time/clock.h"
 #include "absl/time/time.h"
 #include "ceres/callbacks.h"
 #include "ceres/gradient_problem.h"
diff --git a/internal/ceres/line_search.cc b/internal/ceres/line_search.cc
index 9b6b71a..79c4393 100644
--- a/internal/ceres/line_search.cc
+++ b/internal/ceres/line_search.cc
@@ -43,11 +43,13 @@
 #include "absl/log/log.h"
 #include "absl/strings/str_cat.h"
 #include "absl/strings/str_format.h"
+#include "absl/time/time.h"
 #include "ceres/evaluator.h"
 #include "ceres/function_sample.h"
 #include "ceres/internal/eigen.h"
 #include "ceres/map_util.h"
 #include "ceres/polynomial.h"
+#include "ceres/types.h"
 
 namespace ceres::internal {
 
diff --git a/internal/ceres/line_search_minimizer.cc b/internal/ceres/line_search_minimizer.cc
index 756a2ae..63a0d81 100644
--- a/internal/ceres/line_search_minimizer.cc
+++ b/internal/ceres/line_search_minimizer.cc
@@ -51,6 +51,7 @@
 #include "absl/log/check.h"
 #include "absl/log/log.h"
 #include "absl/strings/str_format.h"
+#include "absl/time/time.h"
 #include "ceres/array_utils.h"
 #include "ceres/evaluator.h"
 #include "ceres/internal/eigen.h"
diff --git a/internal/ceres/trust_region_minimizer.cc b/internal/ceres/trust_region_minimizer.cc
index 3cbecbd..43b7ebb 100644
--- a/internal/ceres/trust_region_minimizer.cc
+++ b/internal/ceres/trust_region_minimizer.cc
@@ -43,6 +43,7 @@
 #include "absl/log/check.h"
 #include "absl/log/log.h"
 #include "absl/strings/str_format.h"
+#include "absl/time/time.h"
 #include "ceres/array_utils.h"
 #include "ceres/coordinate_descent_minimizer.h"
 #include "ceres/eigen_vector_ops.h"
diff --git a/internal/ceres/trust_region_preprocessor.cc b/internal/ceres/trust_region_preprocessor.cc
index 0ec94f4..b92e216 100644
--- a/internal/ceres/trust_region_preprocessor.cc
+++ b/internal/ceres/trust_region_preprocessor.cc
@@ -50,6 +50,7 @@
 #include "ceres/reorder_program.h"
 #include "ceres/suitesparse.h"
 #include "ceres/trust_region_strategy.h"
+#include "ceres/types.h"
 
 namespace ceres::internal {