diff -Naupr mdsplib-0.11.orig/src/dcdmtrmk.c mdsplib-0.11/src/dcdmtrmk.c
--- mdsplib-0.11.orig/src/dcdmtrmk.c	2003-12-10 22:28:15.000000000 +0100
+++ mdsplib-0.11/src/dcdmtrmk.c	2009-06-11 12:00:39.887533211 +0200
@@ -1987,11 +1987,11 @@ MDSP_BOOL static isLTGfreq( char **strin
    }
    else {
  
+      (--string);
+ 
       if( *string == NULL )
          return FALSE;
  
-      (--string);
- 
  
       LTG_FREQ_FLAG = FALSE;
                         /*-- CHECK FOR LIGHTNING FREQUENCY -----------*/