diff --git a/src/fix_wall.cpp b/src/fix_wall.cpp
index 83d34c3069..503b87f4a7 100644
--- a/src/fix_wall.cpp
+++ b/src/fix_wall.cpp
@@ -35,7 +35,8 @@ enum{NONE=0,EDGE,CONSTANT,VARIABLE};
 /* ---------------------------------------------------------------------- */
 
 FixWall::FixWall(LAMMPS *lmp, int narg, char **arg) :
-  Fix(lmp, narg, arg)
+  Fix(lmp, narg, arg),
+  nwall(0)
 {
   scalar_flag = 1;
   vector_flag = 1;
@@ -47,7 +48,6 @@ FixWall::FixWall(LAMMPS *lmp, int narg, char **arg) :
 
   // parse args
 
-  nwall = 0;
   int scaleflag = 1;
   fldflag = 0;
   int pbcflag = 0;
diff --git a/src/fix_wall_reflect.cpp b/src/fix_wall_reflect.cpp
index b5c70037b2..dba7cf7036 100644
--- a/src/fix_wall_reflect.cpp
+++ b/src/fix_wall_reflect.cpp
@@ -34,7 +34,8 @@ enum{NONE=0,EDGE,CONSTANT,VARIABLE};
 /* ---------------------------------------------------------------------- */
 
 FixWallReflect::FixWallReflect(LAMMPS *lmp, int narg, char **arg) :
-  Fix(lmp, narg, arg)
+  Fix(lmp, narg, arg),
+  nwall(0)
 {
   if (narg < 4) error->all(FLERR,"Illegal fix wall/reflect command");
 
diff --git a/src/fix_wall_region.cpp b/src/fix_wall_region.cpp
index 824f92eb89..f543c12171 100644
--- a/src/fix_wall_region.cpp
+++ b/src/fix_wall_region.cpp
@@ -34,7 +34,8 @@ enum{LJ93,LJ126,COLLOID,HARMONIC};
 /* ---------------------------------------------------------------------- */
 
 FixWallRegion::FixWallRegion(LAMMPS *lmp, int narg, char **arg) :
-  Fix(lmp, narg, arg)
+  Fix(lmp, narg, arg),
+  idregion(NULL)
 {
   if (narg != 8) error->all(FLERR,"Illegal fix wall/region command");