diff --git a/ext/phar/tar.c b/ext/phar/tar.c
index 062b1c9e6d3..8f12943122f 100644
--- a/ext/phar/tar.c
+++ b/ext/phar/tar.c
@@ -1087,7 +1087,7 @@ nostub:
 #endif
 		PHAR_SET_32(sigbuf, phar->sig_flags);
 		PHAR_SET_32(sigbuf + 4, signature_length);
-		if (8 != php_stream_write(entry.fp, sigbuf, 8) || signature_length != php_stream_write(entry.fp, signature, signature_length)) {
+		if (8 != (int)php_stream_write(entry.fp, sigbuf, 8) || signature_length != (int)php_stream_write(entry.fp, signature, signature_length)) {
 			efree(signature);
 			if (error) {
 				spprintf(error, 0, "phar error: unable to write signature to tar-based phar %s", phar->fname);