diff --git a/src/bootstrap/bootstrap.py b/src/bootstrap/bootstrap.py
index 149350e62a014..e5a710c0a9646 100644
--- a/src/bootstrap/bootstrap.py
+++ b/src/bootstrap/bootstrap.py
@@ -256,7 +256,7 @@ def default_build_triple(verbose):
     if uname is None:
         return 'x86_64-pc-windows-msvc'
 
-    kernel, cputype, processor = uname.decode(default_encoding).split()
+    kernel, cputype, processor = uname.decode(default_encoding).split(maxsplit=2)
 
     # The goal here is to come up with the same triple as LLVM would,
     # at least for the subset of platforms we're willing to target.