diff --git a/fileio.c b/fileio.c
index ba0a1d0..03fc4be 100644
--- a/fileio.c
+++ b/fileio.c
@@ -2006,6 +2006,7 @@ int do_string(__G__ length, option)   /* return PK-type error code */
     unsigned comment_bytes_left;
     unsigned int block_len;
     int error=PK_OK;
+    unsigned int length2;
 #ifdef AMIGA
     char tmp_fnote[2 * AMIGA_FILENOTELEN];   /* extra room for squozen chars */
 #endif
@@ -2292,8 +2293,12 @@ int do_string(__G__ length, option)   /* return PK-type error code */
             seek_zipf(__G__ G.cur_zipfile_bufstart - G.extra_bytes +
                       (G.inptr-G.inbuf) + length);
         } else {
-            if (readbuf(__G__ (char *)G.extra_field, length) == 0)
+            if ((length2 = readbuf(__G__ (char *)G.extra_field, length)) == 0)
                 return PK_EOF;
+            if(length2 < length) {
+              memset (__G__ (char *)G.extra_field+length2, 0 , length-length2);
+              length = length2;
+            }
             /* Looks like here is where extra fields are read */
             getZip64Data(__G__ G.extra_field, length);
 #ifdef UNICODE_SUPPORT
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