Replace sprintf() with PyOS_snprintf().
diff --git a/Mac/Modules/macfsmodule.c b/Mac/Modules/macfsmodule.c
index 9b635e3..26d7d7f 100644
--- a/Mac/Modules/macfsmodule.c
+++ b/Mac/Modules/macfsmodule.c
@@ -706,7 +706,7 @@
 {
 	char buf[512];
 
-	sprintf(buf, "FSSpec((%d, %ld, '%.*s'))",
+	PyOS_snprintf(buf, sizeof(buf), "FSSpec((%d, %ld, '%.*s'))",
 		self->fsspec.vRefNum, 
 		self->fsspec.parID,
 		self->fsspec.name[0], self->fsspec.name+1);