diff --git a/src/GRANULAR/fix_wall_gran.cpp b/src/GRANULAR/fix_wall_gran.cpp
index c98217a7f3..c856b8ff5f 100644
--- a/src/GRANULAR/fix_wall_gran.cpp
+++ b/src/GRANULAR/fix_wall_gran.cpp
@@ -669,7 +669,7 @@ void FixWallGran::post_force(int /*vflag*/)
 
         // store contact info
         if (peratom_flag) {
-          array_atom[i][0] = (double)atom->tag[i];
+          array_atom[i][0] = 1.0;
           array_atom[i][4] = x[i][0] - dx;
           array_atom[i][5] = x[i][1] - dy;
           array_atom[i][6] = x[i][2] - dz;