replace deprecated variable

1 files changed, 1 insertions, 1 deletions

diff --git a/PKGBUILD b/PKGBUILD
index f92e9aed0bc0..40dd8bcb0375 100644
--- a/PKGBUILD
+++ b/PKGBUILD
@@ -132,7 +132,7 @@ build() {
   export MOZ_SOURCE_REPO="$_repo"
   export MOZ_NOSPAM=1
   export MOZBUILD_STATE_PATH="$srcdir/mozbuild"
-  export MACH_USE_SYSTEM_PYTHON=1
+  export MACH_BUILD_PYTHON_NATIVE_PACKAGE_SOURCE=system
 
   # LTO/PGO needs more open files
   ulimit -n 4096