diff --git a/src/lattice.cpp b/src/lattice.cpp
index 0f9b0a7818..8ecf9fed73 100644
--- a/src/lattice.cpp
+++ b/src/lattice.cpp
@@ -28,8 +28,6 @@ using namespace LAMMPS_NS;
 
 #define BIG 1.0e30
 
-enum{NONE,SC,BCC,FCC,HCP,DIAMOND,SQ,SQ2,HEX,CUSTOM};
-
 /* ---------------------------------------------------------------------- */
 
 Lattice::Lattice(LAMMPS *lmp, int narg, char **arg) : Pointers(lmp)
diff --git a/src/lattice.h b/src/lattice.h
index e76fd0507f..65cba9f3ca 100644
--- a/src/lattice.h
+++ b/src/lattice.h
@@ -20,6 +20,8 @@ namespace LAMMPS_NS {
 
 class Lattice : protected Pointers {
  public:
+  enum{NONE,SC,BCC,FCC,HCP,DIAMOND,SQ,SQ2,HEX,CUSTOM};
+
   int style;                           // NONE,SC,FCC,etc
   double xlattice,ylattice,zlattice;   // lattice scale factors in 3 dims
   double a1[3],a2[3],a3[3];            // edge vectors of unit cell