diff --git a/include/nuri/core/molecule.h b/include/nuri/core/molecule.h
index 404f4b1b..38d6100e 100644
--- a/include/nuri/core/molecule.h
+++ b/include/nuri/core/molecule.h
@@ -7,6 +7,7 @@
 #define NURI_CORE_MOLECULE_H_
 
 #include <algorithm>
+#include <cmath>
 #include <cstdint>
 #include <iterator>
 #include <string>
@@ -20,6 +21,7 @@
 #include <absl/base/attributes.h>
 #include <absl/base/optimization.h>
 #include <absl/container/fixed_array.h>
+#include <absl/log/absl_log.h>
 
 #include "nuri/eigen_config.h"
 #include "nuri/core/element.h"
diff --git a/include/nuri/utils.h b/include/nuri/utils.h
index 0b185b42..3562d63d 100644
--- a/include/nuri/utils.h
+++ b/include/nuri/utils.h
@@ -8,6 +8,7 @@
 
 #include <algorithm>
 #include <cstddef>
+#include <cstring>
 #include <filesystem>
 #include <functional>
 #include <initializer_list>
@@ -26,7 +27,6 @@
 #include <Eigen/Dense>
 
 #include <absl/base/optimization.h>
-#include <absl/container/fixed_array.h>
 #include <absl/log/absl_check.h>
 #include <absl/strings/ascii.h>
 
diff --git a/src/algo/guess.cpp b/src/algo/guess.cpp
index a0aa699c..25e5aa09 100644
--- a/src/algo/guess.cpp
+++ b/src/algo/guess.cpp
@@ -7,6 +7,7 @@
 
 #include <algorithm>
 #include <cmath>
+#include <numeric>
 #include <utility>
 #include <vector>
 
@@ -17,8 +18,10 @@
 #include <absl/base/optimization.h>
 #include <absl/container/fixed_array.h>
 #include <absl/container/flat_hash_map.h>
+#include <absl/container/flat_hash_set.h>
 #include <absl/container/inlined_vector.h>
 #include <absl/log/absl_check.h>
+#include <absl/log/absl_log.h>
 
 #include "nuri/eigen_config.h"
 #include "nuri/algo/rings.h"