diff --git a/src/modify.cpp b/src/modify.cpp
index 5c611885b9..5c37aa5c56 100644
--- a/src/modify.cpp
+++ b/src/modify.cpp
@@ -28,6 +28,8 @@
 #include "memory.h"
 #include "error.h"
 
+#include <map>
+
 using namespace LAMMPS_NS;
 using namespace FixConst;