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diff --git a/util/iso2709.c b/util/iso2709.c
index 1bd46e3..7de97f2 100644
--- a/util/iso2709.c
+++ b/util/iso2709.c
@@ -3,10 +3,14 @@
 
    Europagate, 1994-1995.
 
-   $Log: iso2709.c,v $
-   Revision 1.4  1995/02/15 17:45:44  adam
-   Bug fix in iso2709 module.
-
+   iso2709.c,v
+ * Revision 1.5  1995/02/22  15:24:14  adam
+ * Function iso2709_cvt makes a litte check for the format. It returns
+ * NULL if the buffer parameter can never be a MARC record.
+ *
+ * Revision 1.4  1995/02/15  17:45:44  adam
+ * Bug fix in iso2709 module.
+ *
  * Revision 1.3  1995/02/10  17:05:18  adam
  * New function iso2709_display to display MARC records in a
  * line-by-line format. The iso2709_cvt function no longer
@@ -100,6 +104,11 @@ Iso2709Rec iso2709_cvt (const char *buf)
     p->base_address = atoin (buf+12, 4);
     strncpyx (p->user_systems, buf+17, 3);
 
+    if (p->record_length < 26)
+    {
+        free (p);
+        return NULL;
+    }
     p->length_data_entry = atoin (buf+20, 1);
     p->length_starting = atoin (buf+21, 1);
     p->length_implementation = atoin (buf+22, 1);