diff --git a/fsendfile.c b/fsendfile.c
index efc9786..61921c8 100644
--- a/fsendfile.c
+++ b/fsendfile.c
@@ -41,10 +41,11 @@
  * The number of bytes copied.  If an error is detected -1 is returned
  * and @errno will be set accordingly.
  */
-size_t fsendfile(FILE *src, FILE *dst, size_t len)
+ssize_t fsendfile(FILE *src, FILE *dst, size_t len)
 {
 	char *buf;
-	size_t blk = BUFSIZ, num = 0, tot = 0;
+	size_t tot = 0;
+	ssize_t blk = BUFSIZ, num = 0;
 
         if (!src) {
                 errno = EINVAL;
@@ -73,7 +74,7 @@ size_t fsendfile(FILE *src, FILE *dst, size_t len)
 
 	free(buf);
 
-	return (num == (size_t)-1) ? (size_t)-1 : tot;
+	return (num == -1) ? -1 : (ssize_t)tot;
 }
 
 #ifdef UNITTEST
diff --git a/lite.h b/lite.h
index 730eb87..4a6c7e8 100644
--- a/lite.h
+++ b/lite.h
@@ -56,7 +56,7 @@ FILE   *tempfile   (void);
 ssize_t copyfile   (char *src, char *dst, int len, int sym);
 int     movefile   (char *src, char *dst);
 int     fcopyfile  (FILE *src, FILE *dst);
-size_t  fsendfile  (FILE *src, FILE *dst, size_t len);
+ssize_t fsendfile  (FILE *src, FILE *dst, size_t len);
 
 int     ifconfig   (char *ifname, char *addr, char *mask, int up);