Index: uspace/app/tester/vfs/vfs1.c
===================================================================
--- uspace/app/tester/vfs/vfs1.c	(revision 855e0d811a98ab099ac72bbad3f412912d809f2c)
+++ uspace/app/tester/vfs/vfs1.c	(revision 0b0f4bbb6bb3dcf1707e2828a5a9b5be7c307af4)
@@ -105,5 +105,5 @@
 	if (cnt < 0)
 		return "write() failed";
-	TPRINTF("Written %d bytes\n", cnt);
+	TPRINTF("Written %zd bytes\n", cnt);
 	
 	if (lseek(fd0, 0, SEEK_SET) != 0)
@@ -116,5 +116,11 @@
 			return "read() failed";
 		
-		TPRINTF("Read %d bytes: \".*s\"\n", cnt, cnt, buf);
+		int _cnt = (int) cnt;
+		if (_cnt != cnt) {
+			/* Count overflow, just to be sure. */
+			TPRINTF("Read %zd bytes\n", cnt);
+		} else {
+			TPRINTF("Read %zd bytes: \"%.*s\"\n", cnt, _cnt, buf);
+		}
 	}