diff --git a/src/fix.cpp b/src/fix.cpp
index fbb7450225..8c128b96be 100644
--- a/src/fix.cpp
+++ b/src/fix.cpp
@@ -32,7 +32,8 @@ int Fix::instance_total = 0;
 /* ---------------------------------------------------------------------- */
 
 Fix::Fix(LAMMPS *lmp, int narg, char **arg) : Pointers(lmp),
-id(NULL), style(NULL), eatom(NULL), vatom(NULL)
+id(NULL), style(NULL), extlist(NULL), vector_atom(NULL), array_atom(NULL),
+vector_local(NULL), array_local(NULL), eatom(NULL), vatom(NULL)
 {
   instance_me = instance_total++;
 
diff --git a/src/molecule.cpp b/src/molecule.cpp
index fb7e5a3b50..2253e86af0 100644
--- a/src/molecule.cpp
+++ b/src/molecule.cpp
@@ -37,7 +37,16 @@ using namespace MathConst;
 /* ---------------------------------------------------------------------- */
 
 Molecule::Molecule(LAMMPS *lmp, int narg, char **arg, int &index) :
-  Pointers(lmp)
+  Pointers(lmp), id(NULL), x(NULL), type(NULL), q(NULL), radius(NULL),
+  rmass(NULL), num_bond(NULL), bond_type(NULL), bond_atom(NULL),
+  num_angle(NULL), angle_type(NULL), angle_atom1(NULL), angle_atom2(NULL),
+  angle_atom3(NULL), num_dihedral(NULL), dihedral_type(NULL), dihedral_atom1(NULL),
+  dihedral_atom2(NULL), dihedral_atom3(NULL), dihedral_atom4(NULL), num_improper(NULL),
+  improper_type(NULL), improper_atom1(NULL), improper_atom2(NULL),
+  improper_atom3(NULL), improper_atom4(NULL), nspecial(NULL), special(NULL),
+  shake_flag(NULL), shake_atom(NULL), shake_type(NULL), avec_body(NULL), ibodyparams(NULL),
+  dbodyparams(NULL), dx(NULL), dxcom(NULL), dxbody(NULL), quat_external(NULL),
+  fp(NULL), count(NULL)
 {
   me = comm->me;
 
diff --git a/src/pair_hybrid.cpp b/src/pair_hybrid.cpp
index 3f4392d02a..620ceadfd9 100644
--- a/src/pair_hybrid.cpp
+++ b/src/pair_hybrid.cpp
@@ -31,15 +31,12 @@ using namespace LAMMPS_NS;
 
 /* ---------------------------------------------------------------------- */
 
-PairHybrid::PairHybrid(LAMMPS *lmp) : Pair(lmp)
+PairHybrid::PairHybrid(LAMMPS *lmp) : Pair(lmp),
+  styles(NULL), keywords(NULL), multiple(NULL), nmap(NULL),
+  map(NULL), special_lj(NULL), special_coul(NULL)
 {
   nstyles = 0;
-  styles = NULL;
-  keywords = NULL;
-  multiple = NULL;
-  special_lj = NULL;
-  special_coul = NULL;
-
+  
   outerflag = 0;
   respaflag = 0;
 
diff --git a/src/random_mars.cpp b/src/random_mars.cpp
index fbac44501d..1300cbbb8d 100644
--- a/src/random_mars.cpp
+++ b/src/random_mars.cpp
@@ -22,7 +22,8 @@ using namespace LAMMPS_NS;
 
 /* ---------------------------------------------------------------------- */
 
-RanMars::RanMars(LAMMPS *lmp, int seed) : Pointers(lmp)
+RanMars::RanMars(LAMMPS *lmp, int seed) : Pointers(lmp),
+  u(NULL)
 {
   int ij,kl,i,j,k,l,ii,jj,m;
   double s,t;
diff --git a/src/region.cpp b/src/region.cpp
index f42b4e6ad0..e109b7fd6b 100644
--- a/src/region.cpp
+++ b/src/region.cpp
@@ -28,7 +28,8 @@ using namespace LAMMPS_NS;
 
 /* ---------------------------------------------------------------------- */
 
-Region::Region(LAMMPS *lmp, int narg, char **arg) : Pointers(lmp)
+Region::Region(LAMMPS *lmp, int narg, char **arg) : Pointers(lmp),
+  id(NULL), style(NULL), contact(NULL), list(NULL), xstr(NULL), ystr(NULL), zstr(NULL), tstr(NULL)
 {
   int n = strlen(arg[0]) + 1;
   id = new char[n];
diff --git a/src/region_cylinder.cpp b/src/region_cylinder.cpp
index 3d5590b59e..3f2715ea3e 100644
--- a/src/region_cylinder.cpp
+++ b/src/region_cylinder.cpp
@@ -30,7 +30,7 @@ enum{CONSTANT,VARIABLE};
 /* ---------------------------------------------------------------------- */
 
 RegCylinder::RegCylinder(LAMMPS *lmp, int narg, char **arg) :
-  Region(lmp, narg, arg)
+  Region(lmp, narg, arg), rstr(NULL)
 {
   options(narg-8,&arg[8]);
 
diff --git a/src/region_intersect.cpp b/src/region_intersect.cpp
index 468bd28670..fbbbb575b2 100644
--- a/src/region_intersect.cpp
+++ b/src/region_intersect.cpp
@@ -23,8 +23,10 @@ using namespace LAMMPS_NS;
 /* ---------------------------------------------------------------------- */
 
 RegIntersect::RegIntersect(LAMMPS *lmp, int narg, char **arg) :
-  Region(lmp, narg, arg)
+  Region(lmp, narg, arg), idsub(NULL)
 {
+  nregion = 0;
+  
   if (narg < 5) error->all(FLERR,"Illegal region command");
   int n = force->inumeric(FLERR,arg[2]);
   if (n < 2) error->all(FLERR,"Illegal region command");
diff --git a/src/region_union.cpp b/src/region_union.cpp
index 51bb1b339d..b78ee5580a 100644
--- a/src/region_union.cpp
+++ b/src/region_union.cpp
@@ -24,8 +24,10 @@ using namespace LAMMPS_NS;
 
 /* ---------------------------------------------------------------------- */
 
-RegUnion::RegUnion(LAMMPS *lmp, int narg, char **arg) : Region(lmp, narg, arg)
+RegUnion::RegUnion(LAMMPS *lmp, int narg, char **arg) : Region(lmp, narg, arg),
+  idsub(NULL)
 {
+  nregion = 0;
   if (narg < 5) error->all(FLERR,"Illegal region command");
   int n = force->inumeric(FLERR,arg[2]);
   if (n < 2) error->all(FLERR,"Illegal region command");
diff --git a/src/respa.cpp b/src/respa.cpp
index 7d258a0b4b..db0f11d5b3 100644
--- a/src/respa.cpp
+++ b/src/respa.cpp
@@ -44,8 +44,10 @@ using namespace LAMMPS_NS;
 
 /* ---------------------------------------------------------------------- */
 
-Respa::Respa(LAMMPS *lmp, int narg, char **arg) : Integrate(lmp, narg, arg)
+Respa::Respa(LAMMPS *lmp, int narg, char **arg) : Integrate(lmp, narg, arg),
+step(NULL), loop(NULL), hybrid_level(NULL), hybrid_compute(NULL), newton(NULL), fix_respa(NULL)
 {
+  nhybrid_styles = 0;
   if (narg < 1) error->all(FLERR,"Illegal run_style respa command");
 
   nlevels = force->inumeric(FLERR,arg[0]);