diff --git a/test/compare_file.c b/test/compare_file.c
index 1660c1e0..38620d98 100644
--- a/test/compare_file.c
+++ b/test/compare_file.c
@@ -5,7 +5,7 @@
   To compare tree /media/dvd and /original/dir :
       find /media/dvd -exec compare_file '{}' /media/dvd /original/dir ';'
 
-  Copyright 2008 - 2014 Thomas Schmitt, <scdbackup@gmx.net>
+  Copyright 2008 - 2015 Thomas Schmitt, <scdbackup@gmx.net>
 
   Provided under GPL version 2 or later.
 
@@ -282,6 +282,18 @@ int main(int argc, char **argv)
           argv[0], argv[1], argv[2]);
    exit(2);
  }
+ if(strlen(argv[1]) >= 4096) {
+   fprintf(stderr, "path exceeds size limit of 4095\n");
+   exit(3);
+ }
+ if(strlen(argv[1]) - strlen(argv[2]) > 4000) {
+   fprintf(stderr, "common address part exceeds size limit of 4000\n");
+   exit(3);
+ }
+ if(strlen(argv[3]) + 1 + strlen(argv[1]) - strlen(argv[2]) >= 4096) {
+   fprintf(stderr, "prefix2 exceeds size limit of 4095\n");
+   exit(3);
+ }
  strcpy(adr1, argv[1]);
  strcpy(adrc, argv[1]+strlen(argv[2]));
  sprintf(adr2, "%s%s%s",