diff --git a/build.sh b/build.sh
index 83f38a2..b7e98bf 100755
--- a/build.sh
+++ b/build.sh
@@ -55,6 +55,7 @@ popd
 
 pushd "$mozilla_release"
 export MACH_BUILD_PYTHON_NATIVE_PACKAGE_SOURCE=none
+cargo fetch
 ./mach build
 gradle publishWithGeckoBinariesReleasePublicationToMavenLocal
 gradle exoplayer2:publishReleasePublicationToMavenLocal