diff --git a/src/define_ov.f90 b/src/define_ov.f90
index e8f70c35305d940ec93964f6a1cf42e9e2ab8ca2..f31251992787f2fb40852e268341846fd50886a0 100644
--- a/src/define_ov.f90
+++ b/src/define_ov.f90
@@ -49,10 +49,11 @@ type (thread) threadinfo
 
 integer iproc, nproc, err, ierr, levelv
 integer nface, nlsf, i, j, k, np, kfix
-double precision s,e2d,xlsf,crit,wpreiso,evisc,is_plas
+double precision s,e2d,xlsf,crit,wpreiso,evisc
 integer ioctree_number_of_elements
 external ioctree_number_of_elements
 double precision current_time,activation_time
+logical is_plas
 
 !------------------------------------------------------------------------------|
 !------------------------------------------------------------------------------|