diff --git a/Simulator.f90 b/Simulator.f90
index d61501e..6b8ee92 100644
--- a/Simulator.f90
+++ b/Simulator.f90
@@ -122,7 +122,7 @@ contains
     end subroutine Simulate
 
     subroutine write_variables
-    
+        !implicit none
     end subroutine
 
     subroutine read_variables