diff --git a/Dockerfile.build.macosx b/Dockerfile.build.macosx
index e4a805a..5494dbd 100644
--- a/Dockerfile.build.macosx
+++ b/Dockerfile.build.macosx
@@ -3,5 +3,5 @@
 RUN apt-get install -y make git python3
 
 # Install Build Tools
-ADD osxcross.tar.gz ./
+ADD osxcross.tar.bz2 ./