diff --git a/src/EXTRA-FIX/fix_viscous_sphere.cpp b/src/EXTRA-FIX/fix_viscous_sphere.cpp
index eabb625737..e0a4f910ed 100644
--- a/src/EXTRA-FIX/fix_viscous_sphere.cpp
+++ b/src/EXTRA-FIX/fix_viscous_sphere.cpp
@@ -36,7 +36,7 @@ enum { NONE, TYPE, VARIABLE };
 
 FixViscousSphere::FixViscousSphere(LAMMPS *_lmp, int narg, char **arg) :
     Fix(_lmp, narg, arg), scalegamma(nullptr), scaleval(nullptr), scalevarid(nullptr),
-    scalestyle(NONE)
+    scalestyle(NONE), scalevar(-1)
 {
   dynamic_group_allow = 1;
 
diff --git a/src/GRANULAR/fix_damping_cundall.cpp b/src/GRANULAR/fix_damping_cundall.cpp
index ee4cfaa950..0a2f27061b 100644
--- a/src/GRANULAR/fix_damping_cundall.cpp
+++ b/src/GRANULAR/fix_damping_cundall.cpp
@@ -36,7 +36,7 @@ enum { NONE, TYPE, VARIABLE };
 
 FixDampingCundall::FixDampingCundall(LAMMPS *_lmp, int narg, char **arg) :
     Fix(_lmp, narg, arg), scalegamma(nullptr), scaleval(nullptr), scalevarid(nullptr),
-    scalestyle(NONE)
+    scalestyle(NONE), scalevar(-1)
 {
   dynamic_group_allow = 1;