diff --git a/src/fix_controller.cpp b/src/fix_controller.cpp
index d931686515..ee3e97c942 100644
--- a/src/fix_controller.cpp
+++ b/src/fix_controller.cpp
@@ -33,7 +33,8 @@ enum{COMPUTE,FIX,VARIABLE};
 /* ---------------------------------------------------------------------- */
 
 FixController::FixController(LAMMPS *lmp, int narg, char **arg) : 
-  Fix(lmp, narg, arg)
+  Fix(lmp, narg, arg),
+  pvID(NULL), cvID(NULL)
 {
   if (narg != 11) error->all(FLERR,"Illegal fix controller command");
 
@@ -50,8 +51,6 @@ FixController::FixController(LAMMPS *lmp, int narg, char **arg) :
   ki = force->numeric(FLERR,arg[6]);
   kd = force->numeric(FLERR,arg[7]);
 
-  pvID = cvID = NULL;
-
   // process variable arg
 
   int iarg = 8;
diff --git a/src/fix_deform.cpp b/src/fix_deform.cpp
index 7003b4d396..171a90ba3a 100644
--- a/src/fix_deform.cpp
+++ b/src/fix_deform.cpp
@@ -46,7 +46,8 @@ enum{NO_REMAP,X_REMAP,V_REMAP};
 
 /* ---------------------------------------------------------------------- */
 
-FixDeform::FixDeform(LAMMPS *lmp, int narg, char **arg) : Fix(lmp, narg, arg)
+FixDeform::FixDeform(LAMMPS *lmp, int narg, char **arg) : Fix(lmp, narg, arg),
+rfix(NULL), irregular(NULL), set(NULL)
 {
   if (narg < 4) error->all(FLERR,"Illegal fix deform command");
 
@@ -355,7 +356,6 @@ FixDeform::FixDeform(LAMMPS *lmp, int narg, char **arg) : Fix(lmp, narg, arg)
   next_reneighbor = -1;
 
   nrigid = 0;
-  rfix = NULL;
   flip = 0;
 
   if (force_reneighbor) irregular = new Irregular(lmp);
@@ -368,9 +368,11 @@ FixDeform::FixDeform(LAMMPS *lmp, int narg, char **arg) : Fix(lmp, narg, arg)
 
 FixDeform::~FixDeform()
 {
-  for (int i = 0; i < 6; i++) {
-    delete [] set[i].hstr;
-    delete [] set[i].hratestr;
+  if(set) {
+    for (int i = 0; i < 6; i++) {
+      delete [] set[i].hstr;
+      delete [] set[i].hratestr;
+    }
   }
   delete [] set;
   delete [] rfix;
diff --git a/src/fix_enforce2d.cpp b/src/fix_enforce2d.cpp
index f61cc186c1..21a99e3c16 100644
--- a/src/fix_enforce2d.cpp
+++ b/src/fix_enforce2d.cpp
@@ -26,12 +26,12 @@ using namespace FixConst;
 /* ---------------------------------------------------------------------- */
 
 FixEnforce2D::FixEnforce2D(LAMMPS *lmp, int narg, char **arg) :
-  Fix(lmp, narg, arg)
+  Fix(lmp, narg, arg),
+  flist(NULL)
 {
   if (narg != 3) error->all(FLERR,"Illegal fix enforce2d command");
 
   nfixlist = 0;
-  flist = NULL;
 }
 
 /* ---------------------------------------------------------------------- */
diff --git a/src/fix_external.cpp b/src/fix_external.cpp
index 16494662f7..c7c865cd57 100644
--- a/src/fix_external.cpp
+++ b/src/fix_external.cpp
@@ -29,7 +29,8 @@ enum{PF_CALLBACK,PF_ARRAY};
 /* ---------------------------------------------------------------------- */
 
 FixExternal::FixExternal(LAMMPS *lmp, int narg, char **arg) :
-  Fix(lmp, narg, arg)
+  Fix(lmp, narg, arg),
+  fexternal(NULL)
 {
   if (narg < 4) error->all(FLERR,"Illegal fix external command");
 
@@ -56,7 +57,6 @@ FixExternal::FixExternal(LAMMPS *lmp, int narg, char **arg) :
   // perform initial allocation of atom-based array
   // register with Atom class
 
-  fexternal = NULL;
   grow_arrays(atom->nmax);
   atom->add_callback(0);