diff --git a/build/macosx/esptool-0.4.2-osx.zip.sha b/build/macosx/esptool-0.4.2-osx.zip.sha
new file mode 100644
index 000000000..2dc16d4bb
--- /dev/null
+++ b/build/macosx/esptool-0.4.2-osx.zip.sha
@@ -0,0 +1 @@
+0bc15099eb589dddff3c43f3e8107728a75fcdfb