diff --git a/Formula/rdiff-backup.rb b/Formula/rdiff-backup.rb
index cb5a12fe188..3438356e86c 100644
--- a/Formula/rdiff-backup.rb
+++ b/Formula/rdiff-backup.rb
@@ -26,7 +26,7 @@ class RdiffBackup < Formula
 
   def install
     os = OS.mac? ? "macosx" : "linux-x86_64"
-    system "python3", "setup.py", "build", "--librsync-dir=#{prefix}"
+    system "python3.10", "setup.py", "build", "--librsync-dir=#{prefix}"
     libexec.install Dir["build/lib.#{os}*/rdiff_backup"]
     libexec.install Dir["build/scripts-*/*"]
     man1.install Dir["docs/*.1"]