diff --git a/src/fix_balance.cpp b/src/fix_balance.cpp
index b27fc13632..f29518515c 100644
--- a/src/fix_balance.cpp
+++ b/src/fix_balance.cpp
@@ -35,7 +35,8 @@ enum{LAYOUT_UNIFORM,LAYOUT_NONUNIFORM,LAYOUT_TILED};    // several files
 /* ---------------------------------------------------------------------- */
 
 FixBalance::FixBalance(LAMMPS *lmp, int narg, char **arg) :
-  Fix(lmp, narg, arg)
+  Fix(lmp, narg, arg),
+  fp(NULL), nimbalance(0), imbalance(NULL), imb_fix(NULL), balance(NULL), irregular(NULL)
 {
   if (narg < 6) error->all(FLERR,"Illegal fix balance command");
 
diff --git a/src/fix_box_relax.cpp b/src/fix_box_relax.cpp
index 8dd0b3344d..21bc09b259 100644
--- a/src/fix_box_relax.cpp
+++ b/src/fix_box_relax.cpp
@@ -41,7 +41,8 @@ enum{ISO,ANISO,TRICLINIC};
 /* ---------------------------------------------------------------------- */
 
 FixBoxRelax::FixBoxRelax(LAMMPS *lmp, int narg, char **arg) :
-  Fix(lmp, narg, arg)
+  Fix(lmp, narg, arg),
+  id_temp(NULL), id_press(NULL), tflag(0), pflag(0)
 {
   if (narg < 5) error->all(FLERR,"Illegal fix box/relax command");