diff --git a/Makefile b/Makefile
index 063cf294d5e0b0861cfe55605209766f141245a4_TWFrZWZpbGU=..4f6816e8440bf5b13a1b192cdc8f01a4b9fed34c_TWFrZWZpbGU= 100644
--- a/Makefile
+++ b/Makefile
@@ -8,5 +8,5 @@
 
 # Default to Python 3.
 #
-# Windows ships Python 3 as `python.exe`.
+# Windows ships Python 3 as `python.exe`, which may not be on PATH.  py.exe is.
 ifeq ($(OS),Windows_NT)
@@ -12,5 +12,5 @@
 ifeq ($(OS),Windows_NT)
-PYTHON?=python
+PYTHON?=py -3
 else
 PYTHON?=python3
 endif