diff --git a/scp.c b/scp.c
index 66e46dd..27a5029 100644
--- a/scp.c
+++ b/scp.c
@@ -547,7 +547,7 @@
 #define	FILEMODEMASK	(S_ISUID|S_ISGID|S_IRWXU|S_IRWXG|S_IRWXO)
 		snprintf(buf, sizeof buf, "C%04o %lld %s\n",
 		    (u_int) (stb.st_mode & FILEMODEMASK),
-		    stb.st_size, last);
+		    (long long) stb.st_size, last);
 		if (verbose_mode) {
 			fprintf(stderr, "Sending file modes: %s", buf);
 			fflush(stderr);