diff --git a/autoninja.bat b/autoninja.bat
index 402253231..d3a47452d 100755
--- a/autoninja.bat
+++ b/autoninja.bat
@@ -5,5 +5,5 @@
 
 REM Execute whatever is printed by autoninja.py.
 REM Also print it to reassure that the right settings are being used.
-FOR /f "usebackq tokens=*" %%a in (`python %~dp0autoninja.py %*`) do echo %%a & %%a
+FOR /f "usebackq tokens=*" %%a in (`python %~dp0autoninja.py "%*"`) do echo %%a & %%a