diff --git a/appl/popper/pop_updt.c b/appl/popper/pop_updt.c
index 25610190c..cada72817 100644
--- a/appl/popper/pop_updt.c
+++ b/appl/popper/pop_updt.c
@@ -15,6 +15,7 @@ static char SccsId[] = "@(#)@(#)pop_updt.c	2.3  2.3 3/20/91";
 #include <string.h>
 #include <sys/stat.h>
 #include <sys/file.h>
+#include <fcntl.h>
 #include "popper.h"
 
 extern int      errno;
@@ -79,7 +80,7 @@ POP     *   p;
     }
 
     /* Go to the right places */
-    offset = lseek((int)fileno(p->drop),0,L_XTND) ; 
+    offset = lseek((int)fileno(p->drop),0,SEEK_END) ; 
 
     /*  Append any messages that may have arrived during the session 
         to the temporary maildrop */
@@ -100,7 +101,7 @@ POP     *   p;
 
     /* Synch stdio and the kernel for the POP drop */
     rewind(p->drop);
-    (void)lseek((int)fileno(p->drop),0,L_SET);
+    (void)lseek((int)fileno(p->drop),0,SEEK_SET);
 
     /*  Transfer messages not flagged for deletion from the temporary 
         maildrop to the new maildrop */
@@ -180,7 +181,7 @@ POP     *   p;
     }
 
     /* Go to start of new mail if any */
-    (void)lseek((int)fileno(p->drop),offset,L_SET);
+    (void)lseek((int)fileno(p->drop),offset,SEEK_SET);
 
     while((nchar=read((int)fileno(p->drop),buffer,BUFSIZ)) > 0)
         if ( nchar != write(mfd,buffer,nchar) ) {