diff --git a/tools/ios.py b/tools/ios.py
index 11d606b9a..aac59d24c 100644
--- a/tools/ios.py
+++ b/tools/ios.py
@@ -2,7 +2,7 @@
 import sys
 import subprocess
 import ios_osxcross
-from SCons.Variables import *
+from SCons.Variables import BoolVariable
 
 if sys.version_info < (3,):
 
diff --git a/tools/linux.py b/tools/linux.py
index 099a04847..b10f188dc 100644
--- a/tools/linux.py
+++ b/tools/linux.py
@@ -1,4 +1,4 @@
-from SCons.Variables import *
+from SCons.Variables import BoolVariable
 from SCons.Tool import clang, clangxx
 
 
diff --git a/tools/windows.py b/tools/windows.py
index e64695ae1..a1644a978 100644
--- a/tools/windows.py
+++ b/tools/windows.py
@@ -3,7 +3,7 @@
 import my_spawn
 
 from SCons.Tool import msvc, mingw
-from SCons.Variables import *
+from SCons.Variables import BoolVariable
 
 
 def options(opts):