diff --git a/src/CLASS2/angle_class2.cpp b/src/CLASS2/angle_class2.cpp
index 1dbaaf0568..118179ad91 100644
--- a/src/CLASS2/angle_class2.cpp
+++ b/src/CLASS2/angle_class2.cpp
@@ -18,17 +18,17 @@
 
 #include "angle_class2.h"
 
-#include <cmath>
-#include <cstring>
 #include "atom.h"
-#include "neighbor.h"
-#include "domain.h"
 #include "comm.h"
+#include "domain.h"
+#include "error.h"
 #include "force.h"
 #include "math_const.h"
 #include "memory.h"
-#include "error.h"
+#include "neighbor.h"
 
+#include <cmath>
+#include <cstring>
 
 using namespace LAMMPS_NS;
 using namespace MathConst;