diff --git a/src/DAMASK_interface.f90 b/src/DAMASK_interface.f90
index 6d5cbbdb6..04106d040 100644
--- a/src/DAMASK_interface.f90
+++ b/src/DAMASK_interface.f90
@@ -25,7 +25,7 @@ module DAMASK_interface
   
   implicit none
   private
-  logical,                       public, protected :: &
+  logical,          volatile,    public, protected :: &
     SIGTERM, &                                                                                      !< termination signal 
     SIGUSR1, &                                                                                      !< 1. user-defined signal
     SIGUSR2                                                                                         !< 2. user-defined signal