diff --git a/CASCADE/update_time_step.f b/CASCADE/update_time_step.f
index 62c28dad36dea2f9afab62b8ea9249b96c941a5e..f6a34dbe4af6d035febfac6f7cbc39f01571001e 100644
--- a/CASCADE/update_time_step.f
+++ b/CASCADE/update_time_step.f
@@ -33,6 +33,9 @@ c OUTPUT:  dt          = new time step length
 c subroutines called:
 c NONE
 
+      double precision  dhminfluv,dhmaxfluv
+      double precision  dhmindiff,dhmaxdiff
+
       common /vocal/ ivocal
 
       real xkf(*)