diff --git a/detect_host_arch.py b/detect_host_arch.py
index 7669d9ec88..266b457bf7 100755
--- a/detect_host_arch.py
+++ b/detect_host_arch.py
@@ -4,10 +4,12 @@
 # found in the LICENSE file.
 """Outputs host CPU architecture in format recognized by gyp."""
 
+from functools import lru_cache
 import platform
 import re
 
 
+@lru_cache(maxsize=None)
 def HostArch():
     """Returns the host architecture with a predictable string."""
     host_arch = platform.machine().lower()
diff --git a/tests/detect_host_arch_test.py b/tests/detect_host_arch_test.py
index f3e8ebaa06..f5a8bda174 100644
--- a/tests/detect_host_arch_test.py
+++ b/tests/detect_host_arch_test.py
@@ -47,6 +47,7 @@ class DetectHostArchTest(unittest.TestCase):
             platform.machine.return_value = machine
             platform.processor.return_value = processor
             platform.architecture.return_value = arch
+            detect_host_arch.HostArch.cache_clear()
             self.assertEqual(expected, detect_host_arch.HostArch())