diff --git a/Makefile b/Makefile
index 19827cd68..7fa1e22c2 100644
--- a/Makefile
+++ b/Makefile
@@ -1,11 +1,21 @@
 SHELL := /bin/bash
 
 ifeq ($(OS),Windows_NT)
-	PYTHON_BIN := python
-	ACTIVATE_SCRIPT := pyenv/Scripts/activate
+	ifndef ACTIVATE_SCRIPT
+		ACTIVATE_SCRIPT := pyenv/Scripts/activate
+	endif
+
+	ifndef PYTHON_BIN
+		PYTHON_BIN := python
+	endif
 else
-	PYTHON_BIN := python3
-	ACTIVATE_SCRIPT := pyenv/bin/activate
+	ifndef ACTIVATE_SCRIPT
+		ACTIVATE_SCRIPT := pyenv/bin/activate
+	endif
+
+	ifndef PYTHON_BIN
+		PYTHON_BIN := python3
+	endif
 endif
 
 ifndef ANKI_EXTRA_PIP
diff --git a/rspy/Makefile b/rspy/Makefile
index 9aafb50e5..e961fca97 100644
--- a/rspy/Makefile
+++ b/rspy/Makefile
@@ -2,9 +2,13 @@ SHELL := /bin/bash
 FIND := $(if $(wildcard /bin/find),/bin/find,/usr/bin/find)
 
 ifeq ($(OS),Windows_NT)
-	PYTHON_BIN := python
+	ifndef PYTHON_BIN
+		PYTHON_BIN := python
+	endif
 else
-	PYTHON_BIN := python3
+	ifndef PYTHON_BIN
+		PYTHON_BIN := python3
+	endif
 endif
 
 .SHELLFLAGS := -eu -o pipefail -c